diff --git a/.npmrc b/.npmrc
new file mode 100644
index 0000000..5345153
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1,4 @@
+# Use the canonical npm registry. registry.npmmirror.com's advisory endpoint
+# returns NOT_IMPLEMENTED, which breaks `npm audit`; pinning here also keeps
+# package-lock.json from drifting to mixed registries. See docs/dependencies.md.
+registry=https://registry.npmjs.org/
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..0f15a88
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,40 @@
+# Agent & contributor notes
+
+Operational guidance for humans and coding agents working in this repo.
+
+## Dependencies / npm
+
+- **Registry:** npmjs, pinned in `.npmrc`. Do not switch to
+  `registry.npmmirror.com` or commit a lockfile that resolves from it — its
+  advisory endpoint returns `NOT_IMPLEMENTED`, so `npm audit` silently can't run.
+- **The `overrides` in `package.json` are intentional security pins** for
+  `@cursor/sdk`'s transitive deps (`tar`, `undici`, `@tootallnate/once`) — there
+  is no upstream `@cursor/sdk` fix yet. Do not remove or loosen them, and do not
+  regenerate the lockfile against another registry. Rationale, verification, and
+  removal conditions live in `docs/dependencies.md` (removal tracked in #5).
+- **Auditing:** `npm audit --audit-level=moderate` (npmjs registry required).
+
+## Build, test & run
+
+Single Node.js/TypeScript CLI — no server, no watch mode.
+
+- Commands: `npm run build` (tsc), `npm test` (builds, then `node --test dist/test/*.test.js`),
+  `npm run typecheck`. `build`/`test` clean `dist/` first (`prebuild`), so stale compiled output
+  from a branch switch can't leak into a run.
+- After editing `src/`, rebuild and invoke with `node dist/src/cli.js <command>` (no `npm link` step).
+- **Offline / no-credentials runs:** `plan-pr <PR-URL>` is plan-only by design — it builds the
+  DAG → state → report → Canvas without calling Cursor Cloud. It still reads the PR's findings from
+  GitHub unless you pass them locally with `--scored <clusters.scored.json>`, which makes the run
+  fully offline:
+  `node dist/src/cli.js plan-pr https://github.com/OWNER/REPO/pull/N --scored clusters.scored.json`.
+  On the lower-level `explore`/`triage-pr` commands the same cloud-skip is the `--plan-only` flag.
+- **Live commands** — `run-pr`, `post-pr`, `run-dag`, and `triage-pr` without `--plan-only` — call
+  Cursor Cloud and/or GitHub and need `CURSOR_API_KEY` plus an authenticated `gh` CLI. Without them
+  the runner still completes, recording per-task `ERROR`/`SKIPPED` instead of crashing.
+- Run artifacts are written under `.quorum/` (gitignored).
+
+## Cursor Cloud
+
+- The cloud-agent environment runs `npm install` on startup (configured in Cursor, not in the repo).
+- Use `--no-canvas-mirror` on offline/CI runs so the runner doesn't write into the Cursor managed
+  canvases directory under `~/.cursor`.
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 120000
index 0000000..47dc3e3
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1 @@
+AGENTS.md
\ No newline at end of file
diff --git a/docs/dependencies.md b/docs/dependencies.md
new file mode 100644
index 0000000..5b86f07
--- /dev/null
+++ b/docs/dependencies.md
@@ -0,0 +1,45 @@
+# Dependency notes
+
+## npm `overrides` (security pins)
+
+`@cursor/sdk@1.0.18` pulls transitive dependencies with `npm audit` findings and
+has no upstream fix yet, so `package.json` pins patched versions via `overrides`:
+
+| Override | Pinned | Consumer (chain) | Scope / why safe | Remove when |
+|----------|--------|------------------|------------------|-------------|
+| `tar` | `^7.5.10` | `sqlite3 → node-gyp@8 / cacache` | **install-time only** — not in the runtime path; used to build sqlite3's native addon | `@cursor/sdk` updates `sqlite3`/`node-gyp` past `tar` 6 |
+| `undici` | `^6.24.0` | `@connectrpc/connect-node@1.7.0` | runtime-inert on Node ≥18 (see below) | connect-node / `@cursor/sdk` ship `undici` ≥6 |
+| `@tootallnate/once` | `^2.0.1` | optional install tooling (`http-proxy-agent`) | optional, install-time | transitive bump |
+
+**Verified (2026-06):** a clean `npm ci` on **Node 26** — which has no `sqlite3`
+prebuilt, so it forces the native source build that actually exercises `tar` —
+succeeds with `tar@7` building the addon; `npm audit --audit-level=moderate`
+(against npmjs) → **0 vulnerabilities**.
+
+### Why `undici` 5→6 is runtime-safe
+`@connectrpc/connect-node@1.7.0`'s only use of `undici` is a `Headers` polyfill
+gated behind `node < 18`:
+
+```js
+const undici_1 = require("undici");
+if (major < 18) {
+  if (typeof globalThis.Headers === "undefined") globalThis.Headers = undici_1.Headers;
+}
+```
+
+This repo requires Node ≥22, so that branch never runs (the global `fetch` /
+`Headers` are used). `undici@6` imports cleanly on Node ≥18.17, and nothing else
+consumes it — so the major bump is inert at runtime here.
+
+### Do not
+- Delete or loosen these overrides (re-introduces the audit findings).
+- Regenerate `package-lock.json` against `registry.npmmirror.com`.
+
+Removal is tracked in #5.
+
+## Registry
+
+Installs and audits use `registry.npmjs.org`, pinned in `.npmrc`.
+`registry.npmmirror.com`'s advisory endpoint returns `NOT_IMPLEMENTED`, so
+`npm audit` cannot run against it. The lockfile should resolve from this single
+registry; if entries drift, run `npm install` with the npmjs registry to converge.
diff --git a/package-lock.json b/package-lock.json
index 0a092ef..913c9fc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,14 +24,14 @@
     },
     "node_modules/@bufbuild/protobuf": {
       "version": "1.10.0",
-      "resolved": "https://registry.npmmirror.com/@bufbuild/protobuf/-/protobuf-1.10.0.tgz",
+      "resolved": "https://registry.npmjs.org/@bufbuild/protobuf/-/protobuf-1.10.0.tgz",
       "integrity": "sha512-QDdVFLoN93Zjg36NoQPZfsVH9tZew7wKDKyV5qRdj8ntT4wQCOradQjRaTdwMhWUYsgKsvCINKKm87FdEk96Ag==",
       "license": "(Apache-2.0 AND BSD-3-Clause)",
       "peer": true
     },
     "node_modules/@connectrpc/connect": {
       "version": "1.7.0",
-      "resolved": "https://registry.npmmirror.com/@connectrpc/connect/-/connect-1.7.0.tgz",
+      "resolved": "https://registry.npmjs.org/@connectrpc/connect/-/connect-1.7.0.tgz",
       "integrity": "sha512-iNKdJRi69YP3mq6AePRT8F/HrxWCewrhxnLMNm0vpqXAR8biwzRtO6Hjx80C6UvtKJ5sFmffQT7I4Baecz389w==",
       "license": "Apache-2.0",
       "peer": true,
@@ -41,7 +41,7 @@
     },
     "node_modules/@connectrpc/connect-node": {
       "version": "1.7.0",
-      "resolved": "https://registry.npmmirror.com/@connectrpc/connect-node/-/connect-node-1.7.0.tgz",
+      "resolved": "https://registry.npmjs.org/@connectrpc/connect-node/-/connect-node-1.7.0.tgz",
       "integrity": "sha512-6vaPIkG/NyhxlYgytLoR9KYbPhczEboFB2OYWkA9qvUz1K7efXfeGrlRxoLtpa+r8VxyIOw73w5ktNe743nD+A==",
       "license": "Apache-2.0",
       "dependencies": {
@@ -57,7 +57,7 @@
     },
     "node_modules/@cursor/sdk": {
       "version": "1.0.18",
-      "resolved": "https://registry.npmmirror.com/@cursor/sdk/-/sdk-1.0.18.tgz",
+      "resolved": "https://registry.npmjs.org/@cursor/sdk/-/sdk-1.0.18.tgz",
       "integrity": "sha512-ha5EGHliMuTNuAqnPHzKFNnND4y6erddTqtxwIt9/p8ER+QsmMoRcP38PwA2sXfZnGvIBiozveBZqa4XwUddCw==",
       "license": "SEE LICENSE IN LICENSE.md",
       "dependencies": {
@@ -81,7 +81,7 @@
     },
     "node_modules/@cursor/sdk-darwin-arm64": {
       "version": "1.0.18",
-      "resolved": "https://registry.npmmirror.com/@cursor/sdk-darwin-arm64/-/sdk-darwin-arm64-1.0.18.tgz",
+      "resolved": "https://registry.npmjs.org/@cursor/sdk-darwin-arm64/-/sdk-darwin-arm64-1.0.18.tgz",
       "integrity": "sha512-gXfNz+n3uf2hWCUcSdU/gBYT7TFlWwJjZAAjXFzBJ3jGu+l7ShQRa9QI2sEKvPNRtUMC/18EcQ26ks1o261Bnw==",
       "cpu": [
         "arm64"
@@ -97,7 +97,7 @@
     },
     "node_modules/@cursor/sdk-darwin-x64": {
       "version": "1.0.18",
-      "resolved": "https://registry.npmmirror.com/@cursor/sdk-darwin-x64/-/sdk-darwin-x64-1.0.18.tgz",
+      "resolved": "https://registry.npmjs.org/@cursor/sdk-darwin-x64/-/sdk-darwin-x64-1.0.18.tgz",
       "integrity": "sha512-nzcPqCvPPnYsuz21olPgandVgGUzDZkHN4cUls4ukm7mddp6XqujFJv8lh9qKmVefl0/3UL2R6GFANggjwifnA==",
       "cpu": [
         "x64"
@@ -113,7 +113,7 @@
     },
     "node_modules/@cursor/sdk-linux-arm64": {
       "version": "1.0.18",
-      "resolved": "https://registry.npmmirror.com/@cursor/sdk-linux-arm64/-/sdk-linux-arm64-1.0.18.tgz",
+      "resolved": "https://registry.npmjs.org/@cursor/sdk-linux-arm64/-/sdk-linux-arm64-1.0.18.tgz",
       "integrity": "sha512-MJyhVryN+0czP48SgMak/KA9xGneQ/gdsnDk1ZTJF+LemaFc+Tv7P1GT80h+3JBfu69kPyIX4epJVjroTMoFEA==",
       "cpu": [
         "arm64"
@@ -129,7 +129,7 @@
     },
     "node_modules/@cursor/sdk-linux-x64": {
       "version": "1.0.18",
-      "resolved": "https://registry.npmmirror.com/@cursor/sdk-linux-x64/-/sdk-linux-x64-1.0.18.tgz",
+      "resolved": "https://registry.npmjs.org/@cursor/sdk-linux-x64/-/sdk-linux-x64-1.0.18.tgz",
       "integrity": "sha512-IaJqcKtXxtQEdPxivQjDWbvynw3UX31V8RdagcZ6RgHOo+B/i/P95D8svSNC4V9nbTHwVbNGfIDQ5S64gMS2hg==",
       "cpu": [
         "x64"
@@ -145,7 +145,7 @@
     },
     "node_modules/@cursor/sdk-win32-x64": {
       "version": "1.0.18",
-      "resolved": "https://registry.npmmirror.com/@cursor/sdk-win32-x64/-/sdk-win32-x64-1.0.18.tgz",
+      "resolved": "https://registry.npmjs.org/@cursor/sdk-win32-x64/-/sdk-win32-x64-1.0.18.tgz",
       "integrity": "sha512-iqcGt1l/3xgnaT+PotY3237oyK3VnOZHtjUxSRP3Q7ahjaqsZVTnCwwljj+nal8ouvXidBHnxQLqGMSC2G6LTg==",
       "cpu": [
         "x64"
@@ -159,25 +159,37 @@
         "rg": "bin/rg.exe"
       }
     },
-    "node_modules/@fastify/busboy": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmmirror.com/@fastify/busboy/-/busboy-2.1.1.tgz",
-      "integrity": "sha512-vBZP4NlzfOlerQTnba4aqZoMhE/a9HY7HRqoOPaETQcSQuWEIyZMHGfVu6w9wGtGK5fED5qRs2DteVCjOH60sA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=14"
-      }
-    },
     "node_modules/@gar/promisify": {
       "version": "1.1.3",
-      "resolved": "https://registry.npmmirror.com/@gar/promisify/-/promisify-1.1.3.tgz",
+      "resolved": "https://registry.npmjs.org/@gar/promisify/-/promisify-1.1.3.tgz",
       "integrity": "sha512-k2Ty1JcVojjJFwrg/ThKi2ujJ7XNLYaFGNB/bWT9wGR+oSMJHMa5w+CUq6p/pVrKeNNgA7pCqEcjSnHVoqJQFw==",
       "license": "MIT",
       "optional": true
     },
+    "node_modules/@isaacs/fs-minipass": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/@isaacs/fs-minipass/-/fs-minipass-4.0.1.tgz",
+      "integrity": "sha512-wgm9Ehl2jpeqP3zw/7mo3kRHFp5MEDhqAdwy1fTGkHAwnkGOVsgpvQhL8B5n1qlb01jV3n/bI0ZfZp5lWA1k4w==",
+      "license": "ISC",
+      "dependencies": {
+        "minipass": "^7.0.4"
+      },
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
+    "node_modules/@isaacs/fs-minipass/node_modules/minipass": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/minipass/-/minipass-7.1.3.tgz",
+      "integrity": "sha512-tEBHqDnIoM/1rXME1zgka9g6Q2lcoCkxHLuc7ODJ5BxbP5d4c2Z5cGgtXAku59200Cx7diuHTOYfSBD8n6mm8A==",
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      }
+    },
     "node_modules/@npmcli/fs": {
       "version": "1.1.1",
-      "resolved": "https://registry.npmmirror.com/@npmcli/fs/-/fs-1.1.1.tgz",
+      "resolved": "https://registry.npmjs.org/@npmcli/fs/-/fs-1.1.1.tgz",
       "integrity": "sha512-8KG5RD0GVP4ydEzRn/I4BNDuxDtqVbOdm8675T49OIG/NGhaK0pjPX7ZcDlvKYbA+ulvVK3ztfcF4uBdOxuJbQ==",
       "license": "ISC",
       "optional": true,
@@ -188,7 +200,7 @@
     },
     "node_modules/@npmcli/move-file": {
       "version": "1.1.2",
-      "resolved": "https://registry.npmmirror.com/@npmcli/move-file/-/move-file-1.1.2.tgz",
+      "resolved": "https://registry.npmjs.org/@npmcli/move-file/-/move-file-1.1.2.tgz",
       "integrity": "sha512-1SUf/Cg2GzGDyaf15aR9St9TWlb+XvbZXWpDx8YKs7MLzMH/BCeopv+y9vzrzgkfykCGuWOlSu3mZhj2+FQcrg==",
       "deprecated": "This functionality has been moved to @npmcli/fs",
       "license": "MIT",
@@ -203,13 +215,13 @@
     },
     "node_modules/@statsig/client-core": {
       "version": "3.31.0",
-      "resolved": "https://registry.npmmirror.com/@statsig/client-core/-/client-core-3.31.0.tgz",
+      "resolved": "https://registry.npmjs.org/@statsig/client-core/-/client-core-3.31.0.tgz",
       "integrity": "sha512-SuxQD6TmVszPG7FoMKwTk/uyBuVFk7XnxI3T/E0uyb7PL7GNjONtfsoh+NqBBVUJVse0CUeSFfgJPoZy1ZOslQ==",
       "license": "ISC"
     },
     "node_modules/@statsig/js-client": {
       "version": "3.31.0",
-      "resolved": "https://registry.npmmirror.com/@statsig/js-client/-/js-client-3.31.0.tgz",
+      "resolved": "https://registry.npmjs.org/@statsig/js-client/-/js-client-3.31.0.tgz",
       "integrity": "sha512-LFa5E0LjT6sTfZv3sNGoyRLSZ1078+agdgOA+Vm1ecjG+KbSOfBLTW7hMwimrJ29slRwbYDzbtKaPJo/R37N2g==",
       "license": "ISC",
       "dependencies": {
@@ -217,18 +229,18 @@
       }
     },
     "node_modules/@tootallnate/once": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmmirror.com/@tootallnate/once/-/once-1.1.2.tgz",
-      "integrity": "sha512-RbzJvlNzmRq5c3O09UipeuXno4tA1FE6ikOjxZK0tuxVv3412l64l5t1W5pj4+rJq9vpkm/kwiR07aZXnsKPxw==",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-2.0.1.tgz",
+      "integrity": "sha512-HqmEUIGRJ5fSXchkVgR5F7qn48bDBzv0kWj/Kfu5e6uci4UlEeng4331LnBkWffb++Ei3FOVLxo8JJWMFBDMeQ==",
       "license": "MIT",
       "optional": true,
       "engines": {
-        "node": ">= 6"
+        "node": ">= 10"
       }
     },
     "node_modules/@types/node": {
       "version": "25.9.3",
-      "resolved": "https://registry.npmmirror.com/@types/node/-/node-25.9.3.tgz",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.9.3.tgz",
       "integrity": "sha512-603BddQMv3pUcr4U2dhujk83N2tTDVr/34wII2B6bJy6g+8WD6yUb11jszNs0gdi4PesVWl7ABt8nYMVpnLUcg==",
       "dev": true,
       "license": "MIT",
@@ -238,14 +250,14 @@
     },
     "node_modules/abbrev": {
       "version": "1.1.1",
-      "resolved": "https://registry.npmmirror.com/abbrev/-/abbrev-1.1.1.tgz",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
       "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
       "license": "ISC",
       "optional": true
     },
     "node_modules/agent-base": {
       "version": "6.0.2",
-      "resolved": "https://registry.npmmirror.com/agent-base/-/agent-base-6.0.2.tgz",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
       "integrity": "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ==",
       "license": "MIT",
       "optional": true,
@@ -258,7 +270,7 @@
     },
     "node_modules/agentkeepalive": {
       "version": "4.6.0",
-      "resolved": "https://registry.npmmirror.com/agentkeepalive/-/agentkeepalive-4.6.0.tgz",
+      "resolved": "https://registry.npmjs.org/agentkeepalive/-/agentkeepalive-4.6.0.tgz",
       "integrity": "sha512-kja8j7PjmncONqaTsB8fQ+wE2mSU2DJ9D4XKoJ5PFWIdRMa6SLSN1ff4mOr4jCbfRSsxR4keIiySJU0N9T5hIQ==",
       "license": "MIT",
       "optional": true,
@@ -271,7 +283,7 @@
     },
     "node_modules/aggregate-error": {
       "version": "3.1.0",
-      "resolved": "https://registry.npmmirror.com/aggregate-error/-/aggregate-error-3.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.1.0.tgz",
       "integrity": "sha512-4I7Td01quW/RpocfNayFdFVk1qSuoh0E7JrbRJ16nH01HhKFQ88INq9Sd+nd72zqRySlr9BmDA8xlEJ6vJMrYA==",
       "license": "MIT",
       "optional": true,
@@ -285,7 +297,7 @@
     },
     "node_modules/ansi-regex": {
       "version": "5.0.1",
-      "resolved": "https://registry.npmmirror.com/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
       "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
       "license": "MIT",
       "optional": true,
@@ -295,14 +307,14 @@
     },
     "node_modules/aproba": {
       "version": "2.1.0",
-      "resolved": "https://registry.npmmirror.com/aproba/-/aproba-2.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-2.1.0.tgz",
       "integrity": "sha512-tLIEcj5GuR2RSTnxNKdkK0dJ/GrC7P38sUkiDmDuHfsHmbagTFAxDVIBltoklXEVIQ/f14IL8IMJ5pn9Hez1Ew==",
       "license": "ISC",
       "optional": true
     },
     "node_modules/are-we-there-yet": {
       "version": "3.0.1",
-      "resolved": "https://registry.npmmirror.com/are-we-there-yet/-/are-we-there-yet-3.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-3.0.1.tgz",
       "integrity": "sha512-QZW4EDmGwlYur0Yyf/b2uGucHQMa8aFUP7eu9ddR73vvhFyt4V0Vl3QHPcTNJ8l6qYOBdxgXdnBXQrHilfRQBg==",
       "deprecated": "This package is no longer supported.",
       "license": "ISC",
@@ -317,14 +329,14 @@
     },
     "node_modules/balanced-match": {
       "version": "1.0.2",
-      "resolved": "https://registry.npmmirror.com/balanced-match/-/balanced-match-1.0.2.tgz",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
       "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
       "license": "MIT",
       "optional": true
     },
     "node_modules/base64-js": {
       "version": "1.5.1",
-      "resolved": "https://registry.npmmirror.com/base64-js/-/base64-js-1.5.1.tgz",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
       "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
       "funding": [
         {
@@ -344,7 +356,7 @@
     },
     "node_modules/bindings": {
       "version": "1.5.0",
-      "resolved": "https://registry.npmmirror.com/bindings/-/bindings-1.5.0.tgz",
+      "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
       "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
       "license": "MIT",
       "dependencies": {
@@ -353,7 +365,7 @@
     },
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-      "resolved": "https://registry.npmmirror.com/undici-types/-/undici-types-7.24.6.tgz",
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-      "resolved": "https://registry.npmmirror.com/unique-filename/-/unique-filename-1.1.1.tgz",
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-      "resolved": "https://registry.npmmirror.com/yallist/-/yallist-4.0.0.tgz",
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-      "resolved": "https://registry.npmmirror.com/zod/-/zod-3.25.76.tgz",
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diff --git a/package.json b/package.json
index 5fc60ec..be9e5c7 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,12 @@
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+  "overrides": {
+    "@tootallnate/once": "^2.0.1",
+    "tar": "^7.5.10",
+    "undici": "^6.24.0"
+  },
+  "overridesNote": "Security pins for @cursor/sdk transitive deps (npm audit -> 0). Do not remove until @cursor/sdk > 1.0.18 bumps them. Rationale: docs/dependencies.md (tracked in #5).",
   "devDependencies": {
     "@types/node": "^25.0.0",
     "typescript": "^6.0.3"
diff --git a/src/adapters/anthropic.ts b/src/adapters/anthropic.ts
index 380ef3c..39057ea 100644
--- a/src/adapters/anthropic.ts
+++ b/src/adapters/anthropic.ts
@@ -1,15 +1,90 @@
+import { fetchPrDiff } from "../github.js";
 import { withRetry } from "../retry.js";
 import type { TaskExecutionInput, TaskExecutionResult, TaskRunnerAdapter } from "../types.js";
 
 const API_BASE = process.env.ANTHROPIC_BASE_URL || "https://api.anthropic.com";
 
 /**
- * Task runner that calls the Anthropic Messages API directly.
- * Set ANTHROPIC_API_KEY to use this adapter.
+ * Upper bound on injected diff size (chars). Claude handles far more, but a
+ * giant diff wastes tokens; beyond this we truncate and tell the model.
+ */
+const DIFF_CHAR_CAP = 200_000;
+
+const SYSTEM_PROMPT = [
+  "You are a read-only PR review exploration agent for Quorum.",
+  "You are given the pull request's unified diff as your view of the code; the",
+  "repository is not otherwise available. Base your analysis on that diff and the",
+  "finding details, and say so explicitly when the relevant code is not shown.",
+  "Do not suggest edits, create commits, push branches, or open pull requests.",
+  "Return a concise human-readable explanation, then end with exactly one fenced",
+  "JSON block as specified.",
+].join("\n");
+
+/**
+ * Compose the user turn: the PR diff (capped) as code context, then the task
+ * prompt. Exported for testing.
+ */
+export function buildDiffPrompt(prompt: string, diff: string): string {
+  const trimmed = diff.trim();
+  if (!trimmed) {
+    return [
+      "NOTE: the pull request diff could not be retrieved, so no code context is",
+      "available. Analyze from the finding details below and flag where you lack",
+      "evidence rather than guessing.",
+      "",
+      prompt,
+    ].join("\n");
+  }
+  const truncated = trimmed.length > DIFF_CHAR_CAP;
+  const body = truncated ? `${trimmed.slice(0, DIFF_CHAR_CAP)}\n... (diff truncated)` : trimmed;
+  return [
+    "The pull request's unified diff is provided below as your view of the code.",
+    ...(truncated ? ["It was truncated to fit; some changes are omitted."] : []),
+    "",
+    "<pr_diff>",
+    body,
+    "</pr_diff>",
+    "",
+    "---",
+    "",
+    prompt,
+  ].join("\n");
+}
+
+/**
+ * Task runner that calls the Anthropic Messages API, injecting the PR diff so the
+ * model can reason about the actual code. Set ANTHROPIC_API_KEY to use it.
  */
 export class AnthropicAdapter implements TaskRunnerAdapter {
   constructor(private options: { maxRetries?: number } = {}) {}
 
+  // Diff fetched once per (repo, pr) and shared across a run's tasks (the promise
+  // is memoized so concurrent first calls don't each fetch). Keyed by repo#pr so
+  // reusing one adapter across PRs can't inject the wrong diff.
+  private diffCache = new Map<string, Promise<string>>();
+
+  private loadDiff(repo: string, pr: string): Promise<string> {
+    const key = `${repo}#${pr}`;
+    let cached = this.diffCache.get(key);
+    if (!cached) {
+      // Retry transient fetch failures (5xx/429/network) before degrading, the
+      // same way the Messages API call is retried.
+      cached = withRetry(() => fetchPrDiff(repo, pr), {
+        maxRetries: this.options.maxRetries,
+        label: `PR diff ${key}`,
+      }).catch((error) => {
+        const detail = error instanceof Error ? error.message : String(error);
+        console.error(
+          `Could not fetch the PR diff for ${key}; Anthropic exploration will run ` +
+            `without code context. Set GITHUB_TOKEN or authenticate gh. (${detail})`,
+        );
+        return "";
+      });
+      this.diffCache.set(key, cached);
+    }
+    return cached;
+  }
+
   async runTask(input: TaskExecutionInput): Promise<TaskExecutionResult> {
     return withRetry(() => this.runOnce(input), {
       maxRetries: this.options.maxRetries,
@@ -25,14 +100,10 @@ export class AnthropicAdapter implements TaskRunnerAdapter {
     }
 
     const started = Date.now();
-    const systemPrompt = [
-      "You are a read-only PR review exploration agent for Quorum.",
-      "Do not suggest edits, create commits, push branches, or open pull requests.",
-      "Return a concise human-readable explanation, then end with exactly one fenced JSON block as specified.",
-    ].join("\n");
+    const diff = await this.loadDiff(input.repo, input.pr);
+    const userPrompt = buildDiffPrompt(input.prompt, diff);
 
     let responseText = "";
-    let assistantOutput = "";
 
     try {
       const response = await fetch(`${API_BASE}/v1/messages`, {
@@ -41,14 +112,13 @@ export class AnthropicAdapter implements TaskRunnerAdapter {
           "Content-Type": "application/json",
           "x-api-key": apiKey,
           "anthropic-version": "2023-06-01",
-          "anthropic-dangerous-direct-browser-access": "true",
         },
         signal: input.signal,
         body: JSON.stringify({
           model: input.model,
-          max_tokens: 4096,
-          system: systemPrompt,
-          messages: [{ role: "user", content: input.prompt }],
+          max_tokens: 8192,
+          system: SYSTEM_PROMPT,
+          messages: [{ role: "user", content: userPrompt }],
         }),
       });
 
@@ -60,7 +130,6 @@ export class AnthropicAdapter implements TaskRunnerAdapter {
       const body = (await response.json()) as {
         content?: Array<{ type: string; text?: string }>;
         stop_reason?: string;
-        id?: string;
       };
 
       // Guard against a malformed success response that omits/nulls content;
@@ -68,10 +137,9 @@ export class AnthropicAdapter implements TaskRunnerAdapter {
       const blocks = Array.isArray(body.content) ? body.content : [];
       for (const block of blocks) {
         if (block.type === "text" && block.text) {
-          assistantOutput += block.text;
+          responseText += block.text;
         }
       }
-      responseText = assistantOutput;
 
       if (body.stop_reason === "max_tokens") {
         console.error(`Task ${input.task.id}: response hit max_tokens limit`);
@@ -84,8 +152,7 @@ export class AnthropicAdapter implements TaskRunnerAdapter {
     }
 
     // Parse validation is owned by the runner (see applyResult): a finished-but-
-    // unparseable response is recorded as a parseError downstream, not a task
-    // error. The adapter only reports that the model produced a response.
+    // unparseable response is recorded as a parseError downstream, not a task error.
     return {
       status: "finished",
       resultText: responseText,
diff --git a/src/github.ts b/src/github.ts
index 9d34307..b3bafe8 100644
--- a/src/github.ts
+++ b/src/github.ts
@@ -77,6 +77,42 @@ async function apiPaginate<T extends { id: number }>(
   return results;
 }
 
+// ---- PR diff ----
+
+/**
+ * Fetch the unified diff for a PR. Prefers the REST diff media type when a token
+ * is available, and falls back to `gh pr diff` if there is no token or the REST
+ * request fails (e.g. token expiry/scope/rate limit) — gh may be authenticated
+ * independently.
+ */
+export async function fetchPrDiff(repo: string, pr: string): Promise<string> {
+  if (token()) {
+    try {
+      const url = `https://api.github.com/repos/${repo}/pulls/${pr}`;
+      const response = await fetch(url, {
+        headers: {
+          Accept: "application/vnd.github.diff",
+          "X-GitHub-Api-Version": "2022-11-28",
+          ...authHeader(),
+        },
+      });
+      if (!response.ok) {
+        const text = await response.text().catch(() => "");
+        throw new Error(
+          `GitHub API GET repos/${repo}/pulls/${pr} (diff) failed (${response.status}): ${text}`,
+        );
+      }
+      return await response.text();
+    } catch (error) {
+      console.error(
+        `REST diff fetch for ${repo}#${pr} failed, falling back to gh: ` +
+          `${error instanceof Error ? error.message : String(error)}`,
+      );
+    }
+  }
+  return runGh(["pr", "diff", pr, "--repo", repo]);
+}
+
 // ---- Exploration comment upsert ----
 
 export interface UpsertResult {
diff --git a/src/runner.ts b/src/runner.ts
index 7d05432..bdde64d 100644
--- a/src/runner.ts
+++ b/src/runner.ts
@@ -113,6 +113,8 @@ async function runOneTask(
         task,
         prompt,
         model,
+        repo: context.repo,
+        pr: context.pr,
         repoUrl: context.repoUrl,
         prUrl: context.prUrl,
         apiKey: context.apiKey,
diff --git a/src/types.ts b/src/types.ts
index eeb693a..59c1d5e 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -105,6 +105,10 @@ export interface TaskExecutionInput {
   task: DagTask;
   prompt: string;
   model: string;
+  /** owner/name slug — used by provider-side fetches (e.g. the PR diff). */
+  repo: string;
+  /** PR number. */
+  pr: string;
   repoUrl: string;
   prUrl?: string;
   apiKey?: string;
diff --git a/test/anthropic.test.ts b/test/anthropic.test.ts
new file mode 100644
index 0000000..066eaa5
--- /dev/null
+++ b/test/anthropic.test.ts
@@ -0,0 +1,32 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { buildDiffPrompt } from "../src/adapters/anthropic.js";
+
+test("buildDiffPrompt embeds the diff as code context", () => {
+  const out = buildDiffPrompt("Investigate the bug.", "diff --git a/x.ts b/x.ts\n+const bug = 1;");
+  assert.match(out, /<pr_diff>/);
+  assert.match(out, /diff --git a\/x\.ts/);
+  assert.match(out, /Investigate the bug\./);
+  assert.doesNotMatch(out, /could not be retrieved/);
+});
+
+test("buildDiffPrompt notes when no diff is available", () => {
+  const out = buildDiffPrompt("Investigate the bug.", "   ");
+  assert.match(out, /could not be retrieved/);
+  assert.match(out, /Investigate the bug\./);
+  assert.doesNotMatch(out, /<pr_diff>/);
+});
+
+test("buildDiffPrompt truncates oversized diffs", () => {
+  const big = "x".repeat(300_000);
+  const out = buildDiffPrompt("prompt", big);
+  assert.match(out, /diff truncated/);
+  assert.ok(out.length < big.length + 2_000, "oversized diff should be capped");
+});
+
+test("buildDiffPrompt keeps blank-line separators around the diff block", () => {
+  const out = buildDiffPrompt("the task", "diff --git a/x b/x\n+y");
+  assert.match(out, /\n\n<pr_diff>/); // blank line before the diff block
+  assert.match(out, /<\/pr_diff>\n\n---/); // blank line after it, before the rule
+  assert.match(out, /---\n\nthe task/); // blank line before the prompt
+});