feat(agent): complete Agent Accountability remediation (Phases 1-9)#3

Merged

paraphilic-ecchymosis merged 10 commits intomainfrom

claude/review-crypto-audit-lib-52H9p

Feb 3, 2026

Commits on Feb 3, 2026

feat(agent): add signature verification hardening (Phase 1 remediation)
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feat(agent): add capability lifecycle and delegation chain verification (Phase 2 remediation)
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fix(agent): correct DenialReason for revoked capabilities and expand test coverage
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feat(agent): add type-safe Timestamp and encapsulate ApprovalResponse (Phase 3 remediation)
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fix(agent): refine evidence classification for Critical severity (Phase 4 remediation)
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feat(agent): fix builder error type and add Id16 base type (Phase 5 remediation)
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feat(agent): add audit event bridge for agent accountability (Phase 6 remediation)
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test(agent): add adversarial boundary condition tests (Phase 7)
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feat(agent): add IdempotencyStore with expiry-aware lookup (Phase 8)
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refactor(agent): replace HashMap<String, _> with HashMap<PublicKey, _> (Phase 9)
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