feat(playbot-lane): onboard Playbot 0.93.1 compatibility + phase-1 mutation evidence

[jokim1]

Summary

Playbot auto-updated 0.92.0 -> 0.93.1, which dropped the native lane back to phase1-evidence-required / release_compatibility: fail because the compatibility seed and mutation evidence only covered 0.90.0 and 0.92.0.

This onboards 0.93.1:

• Adds '0.93.1': releaseCompatibilityShape() to COMPATIBILITY_MANIFEST_SEED.releases. 0.93.1's application/codex DB schemas, IPC channel strings, and preload bridge strings are identical to the shared Phase-0 shape already used by 0.90.0 and 0.92.0, so it reuses that shape rather than introducing a new one.
• Records the Phase 1 disposable-smoke mutation evidence for 0.93.1 (the signed overlay pointer plus per-operation records for create / openThread / send / stop / archiveThread / delete and the gate-8 confinement write-denial proof).

Verification

Against the live 0.93.1 app (CDP reachable):

• doctor --json reports operatingState: native-enabled, mutationsEnabled: true, ready: true.
• ready --json --capability native reports ready: true.
• The smoke created a disposable non-MAIN workspace/thread on the registered disposable project only, exercised all mutation ops plus the confinement probe (readAllowed: true, writeDenied: true), cleaned up, and verified absence.

Notes

The evidence overlay is written solely by the smoke and binds a signed receipt to the lanes-script digest; it was generated with the seed change in place and is not hand-edited.