fix(brain): qualify the reviewed 4.3.26 lifecycle hook contract

[pacphi]

Summary

• Brain 4.3.26 declares eight hook events; the inspector only accepted the exact 4.3.17 two-event contract, so every current install showed a Runtime WARN ("Automatic hook declarations differ from the exact 4.3.17 continuity contract").
• Adds a second exact deep-equal contract, 4.3.26-lifecycle, next to the existing two. It is version-agnostic and rejects any altered, added or removed hook, matcher, command or timeout, so future upstream hook changes still warn until reviewed.
• Fallback warning text now names both reviewed contracts.

Notes

• Qualification is registration-only, not a runtime or safety certification. 4.3.26 adds a PreToolUse decision-gate that can refuse Write/Edit until search_ruvnet is consulted, and a Stop grounding gate.
• Same recurrence class as fix: prevent recurring Codex MCP and Brain warnings #215; each upstream hook expansion needs a newly reviewed contract.

Testing

• New tests: the exact 4.3.26 declaration qualifies; 8 mutations are rejected. The positive test failed before the change.
• pnpm run check passes (typecheck, lint, lint:cc, lint:md, build, full test suite).
• Real ~/.claude install now inspects as 4.3.26-lifecycle with no issues.

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