[milestone Milestone 2] Implement `validate(events)` to run integrity checks and produce a cryptographic...

[telleroutlook]

🤖 Auto-filed from milestone doc bullet.

Repo: WasmAgent/open-agent-audit
Milestone: Milestone 2: Audit Core Pipeline
Bullet:

Implement validate(events) to run integrity checks and produce a cryptographic summary.

Relevant code context (from worktree)

contains 'validate': packages/core/src/index.ts
contains 'validate': packages/core/src/scoring/index.ts
contains 'validate': packages/core/src/validate/index.ts
contains 'events': packages/core/src/drift-guard/index.ts
contains 'events': packages/core/src/drift-guard/index.test.ts
contains 'events': packages/core/src/inventory/index.ts
contains 'integrity': packages/core/src/contamination/index.test.ts
contains 'integrity': packages/core/src/policy-audit/index.ts
contains 'integrity': packages/core/src/policy-audit/index.test.ts

Acceptance criteria

• Command bun install --frozen-lockfile && bun run build && bun run test passes
• The specific work described in the bullet above is implemented in the smallest number of files required.
• No unrelated files touched (git status --short output limited to the intended change).

Notes for the implementer

This issue was auto-created by SweepMilestoneBulletToIssue. The bullet text is verbatim
from the milestone doc. If ambiguous or too large for a single implement cycle,
verify-first should return NEEDS_SPLIT with sub-issue proposals or NEEDS_HUMAN with the blocker.

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Filed automatically.

[telleroutlook]

Verify-first found this issue is already implemented at packages/core/src/validate/index.ts:153. Closing without spawning implementation work.