fix: provider conflict guard and missing plan_delta handler

[ranvier2d2]

Summary

• ProviderCommandReactor: only enforce provider binding when there is an active session — first turn with explicit provider choice is now honoured
• ProviderCommandReactor: prefer requested provider over thread default when no session exists
• CodexAdapter: add codex/event/plan_delta → turn.proposed.delta mapping (was in codexEventMapping.ts but missing from the adapter)
• Test mock: startSession now respects the provider field from the caller

Test plan

• ProviderCommandReactor.test.ts — 19/19 pass (was 18/19)
• CodexAdapter.test.ts — 18/18 pass (was 17/18)
• bun typecheck — 0 errors
• bun lint — 0 errors
• bun fmt — clean

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5b7276e4-59b3-4153-9a59-988faf2383f1

📥 Commits

Reviewing files that changed from the base of the PR and between bbf49ad and afdebee.

📒 Files selected for processing (3)

• apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts
• apps/server/src/orchestration/Layers/ProviderCommandReactor.ts
• apps/server/src/provider/Layers/CodexAdapter.ts

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ci-test-failures

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[ranvier2d2]

Superseded by PR #21 which included the same fixes and was merged first.