refactor(mcp): extract cohesive private modules

[0xLeif]

Replace two textual MCP include chunks with seven private modules for transport, dispatch, confinement, preflight, snapshots, manifest discovery and publication. The facade is 105 lines and the largest implementation module is 1,322. Existing production bodies, cfg gates and the two external entry points are preserved; child tests and shared fixtures move with their code. Complete moved-source scans supplement the historical comment-only scan anchors. The independently reproduced release-test filesystem import regression is fixed.

Local validation passed: all original source-declared tests are conserved, including 124 focused MCP units and 72 MCP integration cases. Full qualification passes 2,583 unit and 462 integration tests, formatting/lint/types, release build, strict 100% contracts, 64 release-candidate controls, 29 required-CI controls and the mandatory pre-push gate. Release-test compilation fails before the import fix and passes afterward. The original combined lane failed with inherited CI/color variables; controlled same-source reruns and the remaining native stages passed, and the failed invocation is retained. Release-profile test execution and other-platform runtime qualification are not claimed.

The user explicitly approved the bounded scope. The supported SpecSync 6.1.1 workflow recorded actual definition consent, verification, agent review and same-PR finalization; the change is archived. Final committed-range Trust reports risk 32/proceed, and the unchanged attestation policy passes with truthful unsigned agent:codex notes. Strict canonical validation covers all 62 specs and 100% of paths/LOC; the final archived-tree strict lifecycle audit passes. Independent GPT parity and source review found no blocker.

Ready for corvid-agent review once updated hosted checks complete. No overlap with PR #800 lifecycle evidence or PR #815 check/fix files. Exact-head external review and required CI remain merge gates; no human code inspection, signature or statistical confidence guarantee is claimed.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-16T14:42:10.191744Z	7399ac9	Draft marked ready

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[Kyntrin]

AI-assisted review submitted at Kyntrin's request for head 7399ac9d8cbabfdcb8728e2adf484edc8758b2ae. The MCP module extraction has exact-head CI/Trust success and an automated review with no findings. I found no blocking issue in the inspected module layout and retained entry points. Approving the reviewed change. This does not represent independent human code inspection or authorize merge, deployment, or any separate lifecycle approval.