diff --git a/.agents/pm/history/pm-web-ulgy.jsonl b/.agents/pm/history/pm-web-ulgy.jsonl
index 00666149..93ade75b 100644
--- a/.agents/pm/history/pm-web-ulgy.jsonl
+++ b/.agents/pm/history/pm-web-ulgy.jsonl
@@ -1,3 +1,14 @@
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diff --git a/.agents/pm/tasks/pm-web-ulgy.toon b/.agents/pm/tasks/pm-web-ulgy.toon
index 899eb858..1784f467 100644
--- a/.agents/pm/tasks/pm-web-ulgy.toon
+++ b/.agents/pm/tasks/pm-web-ulgy.toon
@@ -2,15 +2,28 @@ id: pm-web-ulgy
 title: Cover the routes/pm.ts command surface and the index/server bootstrap in pm-web
 description: "Stage 2 of pm-web-9ulj, tracked separately because routes/pm.ts is 2704 lines at 7.08% function coverage and is far larger than the rest of the route layer combined. It proxies the pm CLI for every item operation, and memory of this codebase records two traps that only real-workspace tests can catch: runPm serves most actions in-process via the SDK, so unmapped positionals are silently dropped unless added to POSITIONAL_KEYS and a fake-pm-binary harness cannot observe it at all; and the --folder parameter honours '..', which without the isSafeTypeFolder guard writes items outside the pm root and is cross-tenant on the hosted deployment. Also covers src/index.ts (42.83% lines, 26.32% functions) and src/server.ts (42.31%, 0% functions). Depends on the stage 1 harness landing first."
 type: Task
-status: open
+status: in_progress
 priority: 2
 tags: []
 created_at: "2026-07-29T17:26:40.207Z"
-updated_at: "2026-08-21T11:42:35.828Z"
+updated_at: "2026-09-18T03:43:37.813Z"
+claim_principal: pi-agent
 author: codex
 estimated_minutes: 1800
 acceptance_criteria: routes/pm.ts is exercised against a real pm workspace rather than a fake pm binary so in-process SDK dispatch is observable; a regression test asserts that a '..' folder traversal is rejected and that items never land outside the pm root; POSITIONAL_KEYS coverage proves no positional is silently dropped; index.ts and server.ts bootstrap paths are covered; thresholds ratchet again
 parent: pm-web-9ulj
+comments[6]{created_at,author,text}:
+  "2026-09-18T03:12:09.394Z",pi-agent,"Baseline npm run coverage: 395/395 tests pass; aggregate src coverage L/B/F 71.06/81.28/65.71. Per-file baseline is captured in the coverage run for this branch; largest gaps are routes/pm.ts 30.67/58.95/14.41, index.ts 52.40/94.59/30.00, routes/github.ts 45.63/71.79/35.71, routes/oidc.ts 48.00/100.00/22.22, server.ts 62.79/33.33/33.33, and db.ts 37.56/70.00/66.67."
+  "2026-09-18T03:12:10.032Z",pi-agent,"Scope note: public/src is intentionally excluded from this PR's coverage gate and is currently unmeasured. It contains 14,884 TypeScript source lines by find public/src -type f -name '*.ts' | xargs wc -l."
+  "2026-09-18T03:28:07.103Z",pi-agent,"Milestone: added real loopback HTTP + real PostgreSQL + real temporary pm workspace coverage. Client B now opens the production SSE endpoint and observes client A's create event. Two edit collaborators concurrently PATCH distinct fields on one item; both writes survive and every history JSONL row parses, with both messages present. A lifecycle scenario exercises rich create, reads, updates, comments, notes, append/history, dependencies, relationships, status views, close/delete, authorization misses, validation errors, and missing-item failures."
+  "2026-09-18T03:28:07.561Z",pi-agent,"Measured after npm run coverage: 398/398 pass; aggregate src L/B/F 76.82/80.06/73.00 (baseline 71.06/81.28/65.71). Ratcheted declared floors to L/B/F 76/80/73; branch floor remains at 80 rather than weakening. Remaining uncovered source lines by file: app.ts 77-78,93-94,153-156,182-183,219-221; auth.ts 10-11; board.ts 49; db.ts 20-27,86-205; health.ts 117-118,222-226,355-365; index.ts 27-30,182-185,196-211,214-236,239-249,251-254,268-279,290-299,311-319,344-399,415-435,451-505,521-582; oidc.ts 136-138,161-162,164-165,170-171,229-230,238-239,299-300,315-316,318-319,327-328,404-405,434-435,441-442,444-445,451-452,567-572; routes/admin.ts 37-39,90-92,107-109,125-127,136-138,149-151,165-167,186-188,202-204,225-227,244-245; routes/auth.ts 84-86,123-125,145-147,161-163,186-188,200-202; routes/extensions.ts 218-229,237-248,256-267; routes/github.ts 120-133,138-161,166-195,249-251,262-264,266-272,274-275,283-290,295-380,385-444,449-466; routes/groups.ts 28-30,60-62,101-103,125-127,143-145,195-197,232-234; routes/oidc.ts 46-52,65-78,91-108,147-152,154-156,163-188,192-247; routes/pm.ts 42-55,71-74,82-93,104-107,167-169,182-184,187-189,191-194,207-213,226-237,287-394,422-452,458,481-484,557-561,592-593,603,766-768,786-788,879-881,916-950,1178-1238,1401-1403,1432-1434,1452-1454,1464-1466,1479-1501,1506-1533,1538-1562,1567-1590,1595-1604,1609-1625,1630-1644,1649-1663,1668-1682,1687-1701,1706-1715,1720-1739,1744-1752,1757-1765,1770-1785,1790-1807,1812-1828,1833-1841,1846-1854,1859-1877,1882-1890,1895-1904,1909-1919,1937-1939,1945-1970,1972-2008,2018-2070,2075-2120,2128-2198,2203-2211,2216-2239,2244-2256,2261-2268,2273-2276,2281-2284,2289-2292,2297-2300,2305-2309,2314-2323,2342-2365,2384-2406,2411-2421,2426-2443,2448-2465,2470-2489,2494-2511,2516-2533,2538-2558,2563-2580,2585-2602,2607-2625,2630-2653,2658-2678,2683-2701,2709-2718,2722-2736,2741-2758,2768-2771,2784-2787,2804-2809; routes/projects.ts 78-80,117-129,137-139,152-154,172-174,191-193; routes/sharing.ts 59-61,156-158,181-183,210-212; server.ts 28-29,57-86; services/mutation-event-watcher.ts 109; services/pm-runner.ts 123-130,162-167,207-213,231-233,326-333,367-369,487-488,534-540,566-572,712-714,803-809,876-878,886-888,1006-1007; services/project-watcher.ts 44-49,156-157,205-206,325-333; services/realtime-bus.ts 187-190,192-196,216-221; services/sse.ts 322-323,344-345,405-429. Files already at 100 lines: crypto.ts, csrf.ts, ical.ts, middleware/auth.ts, rate-limit.ts, route-params.ts, services/fleet-snapshot.ts, services/package-catalog.ts."
+  "2026-09-18T03:35:19.045Z",pi-agent,"First release:check run exposed branch-coverage nondeterminism at 79.97% versus the preserved 80% floor. Added observable alternate-path coverage for unfiltered list/list-all, an SDK-issued compatible pagination cursor, invalid context depth, activity without a limit, presence without connected clients, and a missing item read. The cursor test initially omitted its original filters and correctly received the pm SDK fingerprint-mismatch 400; it now replays the originating type/limit filters and passes."
+  "2026-09-18T03:43:37.813Z",pi-agent,"PR review finding accepted: the task remains in_progress because successful src/index.ts and src/server.ts bootstrap coverage and additional positional actions remain unfinished. This PR is a measured ratchet tranche, not completion of the full item."
 notes[1]{created_at,author,text}:
   "2026-08-21T11:41:29.704Z",codex,"The certified complete-read tranche adds a real-workspace end-to-end test for paginated list-all,complete board/search/export/calendar views and raises routes/pm.ts from 27.28 to 30.70 percent lines and from 7.08 to 14.41 percent functions; branches are 58.95 percent. The shared output-owner test also raises src/index.ts to 51.20 lines,94.12 branches,and 31.58 functions. Most command and bootstrap paths remain uncovered,so this task stays open."
+files[2]{path,scope,note}:
+  test/pm-collaboration.test.ts,project,Real HTTP collaboration and command lifecycle coverage
+  package.json,project,Coverage floors ratcheted to measured whole-number floors
+tests[1]{command,path,scope,timeout_seconds,provenance{author,created_at,source_kind,source_ref}}:
+  npm run coverage,.,project,1200,pi-agent,"2026-09-18T03:28:08.077Z",local_mutation,test/cover-pm-web-server-routes-and-services
 body: ""
diff --git a/package.json b/package.json
index 61a5d900..fa40077c 100644
--- a/package.json
+++ b/package.json
@@ -132,9 +132,9 @@
       "test/*.test.ts"
     ],
     "thresholds": {
-      "lines": 66,
+      "lines": 76,
       "branches": 80,
-      "functions": 60
+      "functions": 73
     },
     "ignore": []
   }
diff --git a/test/pm-collaboration.test.ts b/test/pm-collaboration.test.ts
new file mode 100644
index 00000000..3ca4772c
--- /dev/null
+++ b/test/pm-collaboration.test.ts
@@ -0,0 +1,469 @@
+/**
+ * End-to-end collaboration coverage for pm-web's shared pm command surface.
+ *
+ * Every request crosses a real loopback HTTP server, real PostgreSQL access
+ * checks, and a real temporary pm workspace. The scenarios pin the service's
+ * central guarantees: one collaborator sees another's mutation over SSE, and
+ * concurrent edits to one item are serialized without losing either change.
+ */
+
+import assert from "node:assert/strict";
+import { execFileSync } from "node:child_process";
+import { mkdir, mkdtemp, readFile, rm } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import test from "node:test";
+
+import {
+  authHeaders,
+  authedFetch,
+  ensureSchema,
+  seedProject,
+  seedUser,
+  seedUserShare,
+  startApp,
+  uniqueEmail,
+  uniqueSlug,
+  type AppServer,
+  type SeedUser,
+} from "./helpers/pg-harness.ts";
+
+interface CollaborationHarness {
+  readonly root: string;
+  readonly pmRoot: string;
+  readonly owner: SeedUser;
+  readonly editor: SeedUser;
+  readonly projectId: string;
+}
+
+/** Provision a database project and its matching real pm workspace. */
+async function createCollaborationHarness(): Promise<CollaborationHarness> {
+  await ensureSchema();
+  const root = await mkdtemp(path.join(tmpdir(), "pm-web-"));
+  const owner = await seedUser(uniqueEmail("collab-owner"), { displayName: "Owner" });
+  const editor = await seedUser(uniqueEmail("collab-editor"), { displayName: "Editor" });
+  const project = await seedProject(owner.id, uniqueSlug("collab"), { prefix: "co" });
+  await seedUserShare(project.id, editor.id, "edit");
+  const pmRoot = path.join(root, owner.id, project.slug, ".agents", "pm");
+  await mkdir(path.dirname(pmRoot), { recursive: true });
+  execFileSync("pm", ["init", "--pm-path", pmRoot], { stdio: "ignore" });
+  process.env.PROJECTS_ROOT = root;
+  return { root, pmRoot, owner, editor, projectId: project.id };
+}
+
+/** Decode a successful create response and require the real item id. */
+async function createdItemId(response: Response): Promise<string> {
+  assert.equal(response.status, 201, await response.clone().text());
+  const payload = await response.json() as { id?: string; item?: { id?: string } };
+  const id = payload.item?.id ?? payload.id;
+  assert.ok(id, `create response did not contain an item id: ${JSON.stringify(payload)}`);
+  return id;
+}
+
+/** Read an SSE response until an event name appears, with a bounded timeout. */
+async function waitForEvent(response: Response, eventName: string): Promise<string> {
+  assert.equal(response.status, 200);
+  assert.ok(response.body, "SSE response must expose a readable body");
+  const reader = response.body.getReader();
+  const decoder = new TextDecoder();
+  const timeout = setTimeout(() => void reader.cancel("SSE assertion timed out"), 5_000);
+  let received = "";
+  try {
+    while (!received.includes(`event: ${eventName}`)) {
+      const chunk = await reader.read();
+      assert.equal(chunk.done, false, `SSE closed before ${eventName}: ${received}`);
+      received += decoder.decode(chunk.value, { stream: true });
+    }
+    return received;
+  } finally {
+    clearTimeout(timeout);
+    await reader.cancel();
+  }
+}
+
+/** Create an item through the production HTTP route. */
+async function createItem(server: AppServer, user: SeedUser, projectId: string, title: string): Promise<string> {
+  const response = await authedFetch(server, user, `/api/projects/${projectId}/pm/create`, {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ title, type: "Task", description: "Collaboration fixture" }),
+  });
+  return createdItemId(response);
+}
+
+test("client B receives client A's item mutation over the real SSE route", async (t) => {
+  const previousRoot = process.env.PROJECTS_ROOT;
+  const harness = await createCollaborationHarness();
+  let startedServer: AppServer | undefined;
+  const controller = new AbortController();
+  t.after(async () => {
+    controller.abort();
+    if (startedServer) await startedServer.close();
+    await rm(harness.root, { recursive: true, force: true });
+    if (previousRoot === undefined) delete process.env.PROJECTS_ROOT;
+    else process.env.PROJECTS_ROOT = previousRoot;
+  });
+  const server = await startApp();
+  startedServer = server;
+  const stream = await fetch(server.url(`/api/projects/${harness.projectId}/pm/events?view=items`), {
+    headers: authHeaders(harness.editor),
+    signal: controller.signal,
+  });
+  const [received, itemId] = await Promise.all([
+    waitForEvent(stream, "item-created"),
+    createItem(server, harness.owner, harness.projectId, "SSE shared mutation"),
+  ]);
+  controller.abort();
+  assert.match(received, new RegExp(itemId.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")));
+  assert.match(received, new RegExp(harness.owner.id));
+});
+
+test("concurrent collaborators update one item without a lost write or malformed history", async (t) => {
+  const previousRoot = process.env.PROJECTS_ROOT;
+  const harness = await createCollaborationHarness();
+  let startedServer: AppServer | undefined;
+  t.after(async () => {
+    if (startedServer) await startedServer.close();
+    await rm(harness.root, { recursive: true, force: true });
+    if (previousRoot === undefined) delete process.env.PROJECTS_ROOT;
+    else process.env.PROJECTS_ROOT = previousRoot;
+  });
+  const server = await startApp();
+  startedServer = server;
+
+  const itemId = await createItem(server, harness.owner, harness.projectId, "Concurrent original");
+  const [titleUpdate, descriptionUpdate] = await Promise.all([
+    authedFetch(server, harness.owner, `/api/projects/${harness.projectId}/pm/update/${itemId}`, {
+      method: "PATCH",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({ title: "Owner title", message: "owner concurrent edit" }),
+    }),
+    authedFetch(server, harness.editor, `/api/projects/${harness.projectId}/pm/update/${itemId}`, {
+      method: "PATCH",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({ description: "Editor description", message: "editor concurrent edit" }),
+    }),
+  ]);
+  assert.equal(titleUpdate.status, 200, await titleUpdate.clone().text());
+  assert.equal(descriptionUpdate.status, 200, await descriptionUpdate.clone().text());
+
+  const current = await authedFetch(server, harness.editor, `/api/projects/${harness.projectId}/pm/get/${itemId}`);
+  assert.equal(current.status, 200);
+  const payload = await current.json() as {
+    item?: { title?: string; description?: string };
+    title?: string;
+    description?: string;
+  };
+  const item = payload.item ?? payload;
+  assert.equal(item.title, "Owner title");
+  assert.equal(item.description, "Editor description");
+
+  const historyText = await readFile(path.join(harness.pmRoot, "history", `${itemId}.jsonl`), "utf8");
+  const history = historyText.trim().split("\n").map((line) => JSON.parse(line) as Record<string, unknown>);
+  assert.ok(history.length >= 3, `create plus both updates must be recorded: ${historyText}`);
+  assert.ok(history.every((entry) => typeof entry === "object" && entry !== null));
+  assert.match(historyText, /owner concurrent edit/);
+  assert.match(historyText, /editor concurrent edit/);
+});
+
+test("the real HTTP command surface preserves an item's lifecycle and related records", async (t) => {
+  const previousRoot = process.env.PROJECTS_ROOT;
+  const harness = await createCollaborationHarness();
+  let startedServer: AppServer | undefined;
+  t.after(async () => {
+    if (startedServer) await startedServer.close();
+    await rm(harness.root, { recursive: true, force: true });
+    if (previousRoot === undefined) delete process.env.PROJECTS_ROOT;
+    else process.env.PROJECTS_ROOT = previousRoot;
+  });
+  const server = await startApp();
+  startedServer = server;
+
+  const base = `/api/projects/${harness.projectId}/pm`;
+  const schema = await authedFetch(server, harness.owner, `${base}/schema`);
+  assert.equal(schema.status, 200);
+  const schemaBody = await schema.json() as { types?: unknown[]; statuses?: unknown[] };
+  assert.ok(Array.isArray(schemaBody.types));
+  assert.ok(Array.isArray(schemaBody.statuses));
+
+  const missingTitle = await authedFetch(server, harness.owner, `${base}/create`, {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ description: "no title" }),
+  });
+  assert.equal(missingTitle.status, 400);
+
+  const parentId = await createItem(server, harness.owner, harness.projectId, "Lifecycle parent");
+  const childId = await createItem(server, harness.owner, harness.projectId, "Lifecycle child");
+  const richCreate = await authedFetch(server, harness.owner, `${base}/create`, {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({
+      title: "Rich lifecycle issue",
+      type: "Issue",
+      priority: "1",
+      description: "Every supported create field",
+      tags: "coverage,route",
+      parent: parentId,
+      deadline: "2026-12-31",
+      assignee: "route-owner",
+      sprint: "sprint-1",
+      release: "release-1",
+      estimate: "30",
+      body: "Detailed issue body",
+      acceptanceCriteria: "All fields persist",
+      reporter: "route-reporter",
+      component: "http",
+      severity: "medium",
+      risk: "medium",
+      goal: "goal-1",
+      objective: "objective-1",
+      environment: "test",
+      "blocked-by": parentId,
+      "blocked-reason": "fixture dependency",
+      "repro-steps": "Run the route test",
+      "expected-result": "Fields persist",
+      "actual-result": "Pending assertion",
+      reviewer: "route-reviewer",
+      confidence: "high",
+      "why-now": "Coverage mandate",
+      value: "Regression protection",
+      impact: "Safer collaboration",
+      outcome: "Observable lifecycle",
+      "definition-of-ready": "Fixture prepared",
+    }),
+  });
+  const richId = await createdItemId(richCreate);
+  const richGet = await authedFetch(server, harness.owner, `${base}/get/${richId}`);
+  assert.equal(richGet.status, 200);
+  assert.match(await richGet.text(), /Every supported create field/);
+
+  const invalidCursor = await authedFetch(server, harness.owner, `${base}/list?after=not%2Ba%2Bcursor`);
+  assert.equal(invalidCursor.status, 400);
+  assert.deepEqual(await invalidCursor.json(), {
+    error: "Pagination cursor must be a valid base64url token.",
+    items: [],
+  });
+  const oversizedCursor = await authedFetch(
+    server,
+    harness.owner,
+    `${base}/list-all?after=${"x".repeat(2_049)}`,
+  );
+  assert.equal(oversizedCursor.status, 400);
+
+  const listed = await authedFetch(
+    server,
+    harness.owner,
+    `${base}/list?status=open&type=Task&limit=10&priority=2&sprint=s1&release=r1&assignee=nobody`,
+  );
+  assert.equal(listed.status, 200);
+  const unfiltered = await authedFetch(server, harness.owner, `${base}/list`);
+  assert.equal(unfiltered.status, 200);
+  const all = await authedFetch(server, harness.owner, `${base}/list-all?type=Task&limit=1`);
+  assert.equal(all.status, 200);
+  const allBody = await all.json() as { items?: Array<{ id: string }>; next_cursor?: string };
+  assert.equal(allBody.items?.length, 1);
+  assert.ok(allBody.next_cursor, "two visible Task items with limit=1 must page");
+  const nextPage = await authedFetch(
+    server,
+    harness.owner,
+    `${base}/list-all?type=Task&limit=1&after=${encodeURIComponent(allBody.next_cursor)}`,
+  );
+  assert.equal(nextPage.status, 200, `${allBody.next_cursor}: ${await nextPage.clone().text()}`);
+  const nextBody = await nextPage.json() as { items?: Array<{ id: string }> };
+  assert.equal(nextBody.items?.length, 1);
+  assert.notEqual(nextBody.items?.[0]?.id, allBody.items?.[0]?.id);
+  const unfilteredAll = await authedFetch(server, harness.owner, `${base}/list-all`);
+  assert.equal(unfilteredAll.status, 200);
+  const searched = await authedFetch(server, harness.owner, `${base}/search?q=Lifecycle`);
+  assert.equal(searched.status, 200);
+  assert.equal((await searched.json() as { count?: number }).count, 3);
+
+  const updated = await authedFetch(server, harness.editor, `${base}/update/${childId}`, {
+    method: "PATCH",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({
+      title: "Lifecycle updated",
+      description: "Updated through HTTP",
+      priority: "1",
+      tags: "coverage,collaboration",
+      body: "Lifecycle body",
+      author: "route-test",
+      message: "exercise update flags",
+    }),
+  });
+  assert.equal(updated.status, 200, await updated.clone().text());
+
+  const fetched = await authedFetch(server, harness.owner, `${base}/get/${childId}`);
+  assert.equal(fetched.status, 200);
+  assert.match(await fetched.text(), /Lifecycle updated/);
+  const missingGet = await authedFetch(server, harness.owner, `${base}/get/co-does-not-exist`);
+  assert.equal(missingGet.status, 404);
+
+  const comment = await authedFetch(server, harness.owner, `${base}/comments/${childId}`, {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ text: "Observable comment" }),
+  });
+  assert.equal(comment.status, 201, await comment.clone().text());
+  const comments = await authedFetch(server, harness.editor, `${base}/comments/${childId}`);
+  assert.equal(comments.status, 200);
+  assert.match(await comments.text(), /Observable comment/);
+
+  const note = await authedFetch(server, harness.owner, `${base}/notes/${childId}`, {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ text: "Observable note" }),
+  });
+  assert.equal(note.status, 201, await note.clone().text());
+  const notes = await authedFetch(server, harness.editor, `${base}/notes/${childId}`);
+  assert.equal(notes.status, 200);
+  assert.match(await notes.text(), /Observable note/);
+
+  const append = await authedFetch(server, harness.owner, `${base}/append/${childId}`, {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ text: "Appended body text" }),
+  });
+  assert.equal(append.status, 200, await append.clone().text());
+  const history = await authedFetch(server, harness.editor, `${base}/history/${childId}`);
+  assert.equal(history.status, 200);
+  assert.match(await history.text(), /exercise update flags/);
+
+  const addDependency = await authedFetch(server, harness.owner, `${base}/deps/${childId}`, {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ targetId: parentId, rel: "depends-on" }),
+  });
+  assert.equal(addDependency.status, 201, await addDependency.clone().text());
+  const dependencies = await authedFetch(server, harness.editor, `${base}/deps/${childId}`);
+  assert.equal(dependencies.status, 200);
+  assert.match(await dependencies.text(), new RegExp(parentId));
+  const removeDependency = await authedFetch(server, harness.owner, `${base}/deps/${childId}`, {
+    method: "DELETE",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ targetId: parentId, rel: "depends-on" }),
+  });
+  assert.equal(removeDependency.status, 200, await removeDependency.clone().text());
+
+  const addRelation = await authedFetch(server, harness.owner, `${base}/rel`, {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ from: childId, to: parentId, type: "related-to" }),
+  });
+  assert.equal(addRelation.status, 201, await addRelation.clone().text());
+  const removeRelation = await authedFetch(server, harness.owner, `${base}/rel`, {
+    method: "DELETE",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ from: childId, to: parentId, type: "related-to" }),
+  });
+  assert.equal(removeRelation.status, 200, await removeRelation.clone().text());
+
+  for (const route of [
+    "context?depth=brief",
+    "context?depth=unsupported",
+    "activity?limit=5",
+    "activity",
+    "stats",
+    "aggregate",
+    "calendar",
+    "health",
+  ]) {
+    const response = await authedFetch(server, harness.editor, `${base}/${route}`);
+    assert.equal(response.status, 200, `${route}: ${await response.clone().text()}`);
+  }
+
+  const missingReason = await authedFetch(server, harness.owner, `${base}/close/${childId}`, {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({}),
+  });
+  assert.equal(missingReason.status, 400);
+  const closed = await authedFetch(server, harness.owner, `${base}/close/${childId}`, {
+    method: "POST",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ reason: "Lifecycle complete" }),
+  });
+  assert.equal(closed.status, 200, await closed.clone().text());
+  const deleted = await authedFetch(server, harness.owner, `${base}/delete/${parentId}`, { method: "DELETE" });
+  assert.equal(deleted.status, 200, await deleted.clone().text());
+
+  const absentBase = "/api/projects/00000000-0000-4000-8000-000000000000/pm";
+  const absentRoutes: ReadonlyArray<{ method: string; path: string; body?: Record<string, unknown> }> = [
+    { method: "GET", path: "schema" },
+    { method: "GET", path: "list" },
+    { method: "GET", path: "list-all" },
+    { method: "GET", path: "board" },
+    { method: "GET", path: "search?q=x" },
+    { method: "POST", path: "create", body: { title: "x" } },
+    { method: "GET", path: `get/${childId}` },
+    { method: "PATCH", path: `update/${childId}`, body: { title: "x" } },
+    { method: "POST", path: `close/${childId}`, body: { reason: "x" } },
+    { method: "DELETE", path: `delete/${childId}` },
+    { method: "POST", path: `comments/${childId}`, body: { text: "x" } },
+    { method: "GET", path: `comments/${childId}` },
+    { method: "POST", path: `notes/${childId}`, body: { text: "x" } },
+    { method: "GET", path: `notes/${childId}` },
+    { method: "GET", path: "context" },
+    { method: "GET", path: "activity" },
+    { method: "GET", path: "stats" },
+    { method: "GET", path: "aggregate" },
+    { method: "GET", path: "calendar" },
+    { method: "GET", path: "calendar.ics" },
+    { method: "GET", path: "health" },
+    { method: "POST", path: `append/${childId}`, body: { text: "x" } },
+    { method: "GET", path: `history/${childId}` },
+    { method: "GET", path: `deps/${childId}` },
+    { method: "POST", path: `deps/${childId}`, body: { targetId: parentId } },
+    { method: "DELETE", path: `deps/${childId}`, body: { targetId: parentId } },
+    { method: "POST", path: "rel", body: { from: childId, to: parentId } },
+    { method: "DELETE", path: "rel", body: { from: childId, to: parentId } },
+    { method: "GET", path: "presence" },
+  ];
+  for (const route of absentRoutes) {
+    const response = await authedFetch(server, harness.owner, `${absentBase}/${route.path}`, {
+      method: route.method,
+      headers: route.body ? { "content-type": "application/json" } : undefined,
+      body: route.body ? JSON.stringify(route.body) : undefined,
+    });
+    assert.equal(response.status, 404, `${route.method} ${route.path}: ${await response.clone().text()}`);
+  }
+
+  const presence = await authedFetch(server, harness.owner, `${base}/presence`);
+  assert.equal(presence.status, 200);
+  assert.deepEqual(await presence.json(), { users: [] });
+
+  const missingItem = "co-does-not-exist";
+  const failedMutations: ReadonlyArray<{ method: string; path: string; body?: Record<string, unknown> }> = [
+    { method: "PATCH", path: `update/${missingItem}`, body: { title: "never written" } },
+    { method: "POST", path: `close/${missingItem}`, body: { reason: "not found" } },
+    { method: "DELETE", path: `delete/${missingItem}` },
+    { method: "POST", path: `comments/${missingItem}`, body: { text: "not written" } },
+    { method: "POST", path: `notes/${missingItem}`, body: { text: "not written" } },
+    { method: "POST", path: `append/${missingItem}`, body: { text: "not written" } },
+    { method: "POST", path: `deps/${missingItem}`, body: { targetId: parentId } },
+  ];
+  for (const mutation of failedMutations) {
+    const response = await authedFetch(server, harness.owner, `${base}/${mutation.path}`, {
+      method: mutation.method,
+      headers: mutation.body ? { "content-type": "application/json" } : undefined,
+      body: mutation.body ? JSON.stringify(mutation.body) : undefined,
+    });
+    assert.ok(response.status >= 400, `${mutation.method} ${mutation.path} must fail for a missing item`);
+  }
+
+  for (const invalid of [
+    { path: `comments/${childId}`, body: { text: "" } },
+    { path: `notes/${childId}`, body: { text: "" } },
+    { path: `append/${childId}`, body: { text: "" } },
+    { path: `deps/${childId}`, body: {} },
+    { path: "rel", body: { from: childId } },
+  ]) {
+    const response = await authedFetch(server, harness.owner, `${base}/${invalid.path}`, {
+      method: "POST",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify(invalid.body),
+    });
+    assert.equal(response.status, 400, `${invalid.path}: ${await response.clone().text()}`);
+  }
+});