[milestone Milestone 4 ] Add `schemas/aep/memory-evidence.schema.json` — tamper-evident memory read/wri...

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🤖 Auto-filed from milestone doc bullet.

Repo: WasmAgent/wasmagent-protocol
Milestone: Milestone 4 — Evidence types beyond execution
Bullet:

Add schemas/aep/memory-evidence.schema.json — tamper-evident memory read/write record (keys: mem_ref, op enum[read,write], digest, prior_digest, timestamp_ms); register in index + valid/invalid fixtures.

Relevant code context (from worktree)

new (does not exist yet): schemas/aep/memory-evidence.schema.json
new (does not exist yet): read/write
new (does not exist yet): valid/invalid
contains 'schemas': index.d.ts
contains 'schemas': src/wasmagent_protocol/cli.py
contains 'schemas': src/wasmagent_protocol/drift.py

Implementation note: Files marked "new (does not exist yet)" must be created from scratch. verify-first should return PROCEED (not NOT_YET) — there is no prerequisite blocking this work.

Acceptance criteria

• Command npm install && npm run build && npm 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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