Integrate atomic Task claim recovery into qa-tools

[YueZh127]

Purpose

Human-controlled integration of the reviewed Issue #34 implementation from qa-tools-fkst-staging into qa-tools. The PR is Ready only after the staging package, follow-up CI fix, independent reviews, and all four integration checks completed. Auto-merge remains disabled.

Immutable chain

qa-tools base:                 748a8e71b0a8b5626dffdedded7778b67ec52382
reviewed PR #35 head:          e7bb6412af65d980b676dd693130402343ec7382
PR #35 staging merge:          5a29093247b4d29a16499fe0576ec9d84ee9c6ec
readiness fix commit:          3afcd3773fc174c66b8c2fff76e1cfcff2d7ff61
PR #39 staging merge / head:   f104b1664ce1f1048d9aa1dc7e5c18303645b271

Implementation PR: #35
CI-fix PR: #39
Tracking issue: #34

Included behavior

• Linearizable non-testing Task claim generation and version CAS.
• Exact, capacity-safe machine and profile claim projections.
• Bounded, restart-safe claim recovery and index-bounded expiry maintenance.
• Generation fencing across heartbeat, completion, expiry/requeue, cancellation, interactive close, and action polling/results.
• Bounded authorized-user CAS retries with stable 409 classification and no pre-CAS pending-input/handoff side effects.
• FKST-compatible lowercase test check.
• Deterministic proxy integration readiness synchronized to successful worker claim, without changing production session semantics or retrying expected 409 responses.

No Talos Testing Tool/QARun, provider, deployment, or external authority contract is changed.

Verification and review

• Local gate: build, typecheck, lint, worker bundle, fixture regeneration/no drift, human and JSON contract demos.
• Full suite: 53 files / 370 tests passed; 93.75% statement coverage.
• Standalone Mongo contract: 80 / 80 passed.
• PR github-devloop implementation for #34 #35 CI run 34220614928 passed all implementation checks at e7bb6412.
• PR test(sessions): synchronize worker readiness in proxy flow #39 CI run 34243955406 passed all build/test/image/demo steps at 3afcd377.
• Final PR Integrate atomic Task claim recovery into qa-tools #37 CI run 34244237242 passed all build/test/image/demo steps at f104b166.
• Carver, Franklin, and Lagrange approved focused implementation packages after fix/re-review cycles.
• Locke approved implementation range 748a8e71...e7bb6412.
• Herschel requested and then approved the readiness fix after same-reviewer re-review; final composed range review is recorded before merge.

Merge gate

• Base must remain qa-tools; head must remain qa-tools-fkst-staging@f104b166.
• Use a normal merge commit only.
• Do not squash, rebase, force-push, enable auto-merge, or delete source branches.
• Confirm all four checks and the final composed-range review before merge.

Follow-up boundary

Issues #29, #27, #23, and #24 remain ordered follow-ups. Pending-input and handoff payload durability after a successful Task CAS is tracked separately in #38. No deployment or real Browser canary is claimed by this PR.

[chronoai-fkst]

github-devloop-integration rollup observe sample

status=clean
reason=clean
head_sha=f104b1664ce1f1048d9aa1dc7e5c18303645b271
first_clean_observed_at_ms=1788880950210
sampled_at_ms=1788881842612