[Y-fyan]

Closes #893

Split out from #899 per review feedback, with job_output and wait: true also scoped out of comments and string literals.

What was wrong

• WAITING in src/ptc/batching-guidance.ts did not recognize tools.wait_agent(...) or tools["wait_agent"](...) calls, and violationsOf(shape) did not exclude shape.isWaiting from the shape violation. In addition, WAITING matched against raw code, so // job_output( or "wait: true" inside a comment or string literal still set isWaiting.
• violationsOf(shape) triggered on shape.dispatchSites >= 1 whenever a short program had no loop/Promise.all/branching, misclassifying sequential multi-dispatch scripts (such as a grep whose result determines the next read_file) as "The program ran a single operation".

The change

• src/ptc/batching-guidance.ts:
  • Match wait_agent and job_output only at real tools.* / tools["..."] dispatch sites (WAITING_TOOL = /^(?:wait_agent|job_output)$/u) and match wait: true against readable.bare, so comments and string literals never set isWaiting.
  • Tighten the shape violation condition in violationsOf(shape) to shape.dispatchSites === 1 && !shape.hasBatchingStructure && !shape.hasBranching && !shape.isWaiting && shape.chars < THIN_CODE_CHARS.
• test/batching-trigger.test.mjs & docs/CHANGELOG.md:
  • Pin dot/bracket wait_agent, comment/string counterexamples for wait_agent, job_output and wait: true, dependent multi-dispatch programs, single-read regression, and independence of plan/bypass checks.
  • Add bilingual ## [Unreleased] entry in docs/CHANGELOG.md.

Validation

• One pull_request-triggered CI required run, URL below
• npm run build, npm run typecheck, npm run check:size, and node test/run.mjs batching-trigger pass
• Reverting src/ptc/batching-guidance.ts turns the two new assertions in batching-trigger red
• docs/CHANGELOG.md ## [Unreleased] entry added (English and Chinese)
• No dependency, package.json version, or optionalDependencies change; no model-facing schema/prompt change

$ npm run build
build: bundled 11 browser modules (92116 bytes)
build: generated PTC declarations for 18 capabilities (120358 bytes)
build: compiled src/ to lib/ and copied 60 assets

$ npm run typecheck
(exit 0)

$ npm run check:size
check-file-size: 820 code file(s) checked, all at or under 1000 lines (longest: native/crates/ops-search/src/lib.rs (928))

$ node test/run.mjs batching-trigger
dsh-ops batching-trigger: all 16 checks passed

Revert-red verification:

$ git checkout HEAD~1 -- src/ptc/batching-guidance.ts && npm run build && node test/run.mjs batching-trigger
  FAIL waiting on an agent is a dependency barrier, read only from a real dispatch site (#893)
  FAIL only a single dispatch site earns the single-operation shape notice (#893)
dsh-ops batching-trigger: 2 of 16 check(s) failed

Environment

Linux x64, Node v22.22.1, based on upstream main commit 88ecc72, local source checkout.