feat: versioned project plans, portfolio control and safe handoff

[Ai-Eastern]

Problem and behavior

The prototype stores individual runs but cannot safely carry a versioned project plan across local requirement changes, shared worker limits, or a new project-manager context. This change adds immutable plan snapshots and atomic activation, then binds phase groups to the existing direct/native/Desktop lifecycle instead of adding another executor.

• Preserve attempts, frozen inputs and failed or uncertain dispatch evidence. Reject stale results; retire and release a prepared group only with evidence that it was never assigned or sent.
• Add private multi-project registration, compact incremental status, versioned artifact dependencies, atomic worker reservations, bounded attempts, fair queueing, project/global pause and coordinator epochs.
• Add checked context handoff with a separate successor configuration, preserving original packets, results and acceptance evidence. Explicit model settings are preserved without claiming they prove the service's actual model.
• Add independent A/B/C business fixtures, frozen acceptance, offline evidence verification, installation guidance and deterministic Windows/Linux CI. Keep the bilingual README and existing LangGraph/recovery paths.

Validation

At b97491598de7953ba330d2489fee051f11094951, npm test passed: 250 tests, 249 passed, 1 local symlink-permission skip, 0 failures. The added three-project runtime case executes all four frozen business acceptance suites (17 assertions total) through the actual controller, including B's original-run handoff, A's revision, isolated snapshots, pause and capacity reduction.

The implementation commit 428292cf57202be411d485fae8049b6efba918cf also passed clean-clone npm ci, all 249 tests then present, isolated Skill installation and installed CLI help. Its Windows and Linux CI each passed 249/249 with no skips. git diff --check passed. Four independently reproduced phase/recovery regressions have red-to-green checks in test/phase-execution.test.mjs.

Final head 29c85bc40f739f663a5ad868b9af0bff89b1d2f4: pull-request CI and push CI both passed on Windows and Linux. The final pull-request run passed 250/250 tests on each OS, 0 failures and 0 skips.

Remaining acceptance

This is an implementation milestone, not a completed functional release. This delivery is explicitly limited to code, tests and this PR. Real A/B/C Desktop dispatch, fresh-context B continuation and live host evidence remain pending. Mock host observations and reference patches are explicitly fixture evidence. The 12-task comparison is a protocol only: no paid comparison runs or efficiency claims. No personal configuration was installed or changed, and experimental PR #1 is not merged.