refactor(compaction): migrate replay validation to Effect

[robinbraemer]

Summary

• decode persisted JSON signatures through Effect Schema instead of raw JSON.parse/try-catch
• remove assertion-based response-item mutation by validating reconstructed provider items
• move message and session replay coverage onto @effect/vitest
• remove the ambient environment/dynamic-require/throw Zod loader; normal package resolution remains until the follow-up Effect Schema definition conversion
• delete four satisfied Effect-migration baseline entries

Verification

• bun run check
  • 502 legacy tests passed, 4 skipped
  • 284 Node Effect tests passed
  • 6 Bun-hosted Effect tests passed
  • 114 docs tests passed
  • build, typecheck, docs lint/typecheck passed
• bun tooling/effect-migration/check.ts (410 paths, zero violations)
• git diff --check

Progresses #98 and #102. Does not close either issue: remote transport, extension tests, and the full Zod-to-Effect-Schema definition migration remain.

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	agentos-site	29503d8	Aug 01 2026, 10:21 PM