fix(server): prevent blank active turn IDs from blocking startup

[DavidIlie]

What changed

A blank projection_thread_sessions.active_turn_id failed strict TurnId decoding while the command read model loaded every session row. One malformed projection row could therefore prevent the backend from becoming ready.

All five session read boundaries now normalize empty and whitespace-only values to SQL NULL before decoding. Valid IDs and the strict Schema.NullOr(TurnId) contract are unchanged. This is read-side resilience for legacy, foreign, or manually altered projection rows; the typed writer cannot produce the invalid value.

Validation

• pnpm exec vp test run apps/server/src/orchestration/Layers/ProjectionSnapshotQuery.test.ts apps/server/src/persistence/Layers/ProjectionRepositories.test.ts — 25 tests passed
• pnpm exec vp run --filter t3 typecheck
• Targeted lint, formatting, and git diff --check

Model: GPT-5.6 Sol · Harness: Codex in T3 Code

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[macroscopeapp]

Approvability

Verdict: Approved 3329286

Straightforward defensive bug fix that normalizes blank/whitespace active turn IDs to NULL in SQL read queries. The actual code changes are minimal (4 SQL CASE statements), with comprehensive test coverage. Limited scope, clear intent, no new functionality.

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