feat(orchestration): integrate V2 while preserving Jones behavior

[Mjones13]

This integrates upstream T3 Code’s V2 orchestrator while preserving Jones behavior and reconciling current main. Runtime retry/failure handling, fixtures, voice-review composition, exports, and check groups now use the accepted V2 integration. Legacy protocol-1 capability schemas remain available for older descriptors, but the protocol-2 server does not advertise guarantees it cannot satisfy.

Source commit 101a48488856b07c7bd0fa55d2a7435096593102 and publication commit ae25e5d04bec70c2c0af51af70329a9e9086d15e have identical trees. Both preserve prior integration history and include main ca7c1103c21a05fa7fed5df5dd9fb639aa14e57c.

Verification:

• The final affected union passed 3,509 tests across 129 modules. After the final lint-only import/test-runner fixes and tooltip adjustment, all 87 tests across the four affected test modules passed again.
• Lint passes across all 1,700 PR-changed code files: zero errors, 1,700 warnings, 9.23 seconds locally. Formatting passed for the repair and main-integration paths; commit hooks left verified source content unchanged.
• Contracts, client-runtime, and web typechecks pass. The final web typecheck was repeated after the tooltip change. The server compiler reports zero errors and nine inherited warnings; its exit status remains 1 and is not claimed green.
• Web and server builds passed before the final import/test-runner/tooltip lint fixes. Build warnings remain. An isolated synthetic Node server completed migrations/recovery and returned HTTP 200; all providers were disabled and the owned process was stopped.
• UI interaction and before/after captures remain unavailable: T3 Browser opened, but both environment-port and direct-loopback navigation failed. No live user data or provider turns were used.
• Exact-head CI is now running. GitHub rejected retargeting this PR to main because it is the bottom of native stack #86 (feat(orchestration): integrate V2 while preserving Jones behavior #77 → feat(web): add submitted-work queue mock page (QUEUE-A2) #78 → feat(mcp): allow agents to settle their own thread after completion #85 → fix(contracts): preserve Workstreams schema byte pins #88 → fix(accounting): validate and read through the same RPC session #89). The base remains sync/upstream-before-orchestrator-20261002; stack reconstruction is awaiting owner approval. Earlier CI results do not verify this head. No merge or deployment is requested.

Implementation used Claude Opus 5.5 workers; final repairs and main/publication reconciliation used GPT-6 Astra medium agents through Codex in T3 Code.

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