chore(examples,scripts): drop single-implementation factories and hand-rolled stdlib equivalents

[ScriptedAlchemy]

Summary

Behavior-preserving simplification of examples/* and scripts/*. No publishable package changes (skip-changeset).

1. audiobook-curator operations — done. src/operations/{audible,discovery,evidence,media-mutation,output}.ts no longer define an XOperations interface, a defaultXOperations object, and an xOperations(operations) factory; every one of the 30 route call sites passed the default and no test substituted an implementation. Each module now exports one frozen xOperations registry whose entries are the plain { handler, id, inputSchema, resultSchema } definitions; pass-through handlers reference the domain function directly (handler: searchAudible). Call sites read audibleOperations.audibleSearch. defineCliCommand/CliCommandDefinition (an Object.freeze identity) are gone; src/cli-command.ts keeps only CliCommandContext, and the README sentence describing it is updated.
2. rsc-agent-runtime durable tree — done. New src/dev/durable-tree.ts owns digestBytes, isSafeSegment, assertInside, fsyncPath, writeFileDurably, and copyTree(src, dst, onFile); generation-materializer.ts (copyCheckpointTree) and environment-checkpoint-store.ts (stageTree) import it instead of carrying byte-identical walkers. freezeJson moved next to canonicalJson in canonical-json.ts, and definition-entry.ts writes canonicalJson(...) instead of its own canonicalize + JSON.stringify (same bytes — the materializer already required the executable's output to equal canonicalJson). Not touched: serialize-inspection.ts, rsbuild-runtime-session.ts, rsbuild.config.ts. Two unreachable-in-practice error strings are unified ("<path>" must be a regular directory. and "<path>" escaped its root "<root>".); no test pinned the old wording. docs/architecture/rsc-runtime-workbench.md is generated and was already stale on main for unrelated reasons (CI does not enforce it), so it is left alone rather than regenerating unrelated drift into this PR.
3. foundation.ts sha256File — done. await pipeline(createReadStream(path), hash).
4. slow.tsx sleep — done. setTimeout(ms, 'elapsed', { signal }) from node:timers/promises, resolving 'aborted' on rejection; same values as before, including an already-aborted signal.
5. argv → util.parseArgs — partial. Done for classify-docs-only.mjs and rsc-runtime-topology.mjs (same flag names and defaults; the topology script's rejection of a repeated --root/--output/--check is relaxed to last-wins, which is parseArgs' behavior). Skipped for host-cli-pins.mjs and check-declaration-imports.mjs: packages/agent-bundle/tests/{host-cli-pins,check-declaration-imports}.test.ts (avoid-list) pin the hand-rolled error text (--prefix requires a directory operand for a missing/empty/dash-leading operand; Unknown argument: --bogus), which parseArgs does not produce — translating its ERR_PARSE_ARGS_* errors costs more code than the loops it would replace.
6. measure-hook-cold-start.mjs — done. run is spawnSync(cmd, args, { input, encoding: 'utf8' }); measureOnce is synchronous. measure-preflight-cold-start.mjs untouched.
7. import.meta.dirname — done in host-cli-pins, local-ci, record-claude-hooks-schema-fixtures, sync-license-files (unused fileURLToPath/dirname imports dropped). run-packed-native-smoke.mjs uses spawnSync(...).status.
8. request-render.ts — done. FlightRenderOptions.maximumStderrBytes/terminationGraceMs had no caller (invocation-worker.ts passes only maximumFlightBytes + signal); the bounds are now the module constants.

Validation

• pnpm build && pnpm typecheck && pnpm lint && pnpm test:unit — green (4237 unit tests).
• examples/audiobook-curator: pnpm validate && pnpm build && pnpm typecheck && pnpm test && pnpm test:routes — green (build includes the Claude host validation + package declaration emit).
• examples/rsc-agent-runtime: pnpm typecheck; rstest tests/generation-materializer.test.ts tests/environment-checkpoint-store.test.ts tests/state-and-definition.test.ts — green.
• examples/host-test: pnpm typecheck && pnpm test — green.
• Script smoke runs with the CI/package.json invocations: classify-docs-only.mjs --listing-error → listing-error; --changed-files-count 2 --listing <tsv> → docs-only; count mismatch → truncated-listing; --bogus → exit 1. rsc-runtime-topology.mjs --root . --output … --check runs (reports the pre-existing staleness); missing --output / absolute --output → usage, exit 1. host-cli-pins.mjs print prints the pins. sync-license-files.mjs is a no-op on a synced tree. run-packed-native-smoke.mjs with no host → usage, exit 2. measure-hook-cold-start.mjs --check → hook cold-start ok: median 42.88ms (baseline 39.74ms).

Deslop

Deslop: Claude Fable 5.1, 3 edits (dropped inferred Promise<…> return annotations on the operation handlers; run in the cold-start script returns the spawnSync result instead of re-shaping it; removed the interface-era comment block from cli-command.ts).

Self-review

Reviewer: gpt-5.6-sol-medium (generalPurpose; TraceDecay daemon was down so change-risk-reviewer could not run). Scope: all 53 files vs origin/main, every workflow and package.json script invocation of the touched scripts, production importers of the new durable-tree.ts, fsync/rename ordering, and the stdlib swap semantics (sleep abort path, sha256File digest, parseArgs defaults, spawnSync status). No merge risks found; nothing to fix or dismiss.

[changeset-bot]

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[pkg-pr-new]

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle@657

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/create-agent-bundle@657

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commit: 5824c8b

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