[bitmaster162]

Scope — documentation only

Add exactly one design-DRAFT document: docs/H3_R7A1_SECURITY_ARCHITECTURE_20261011.md (37,928 bytes, SHA-256 945cfa5ebe1043d1af6477feeb2c13285b50d9a0dd8fb0863e3dcf9f2e75a5b5). No H3 native runtime implementation or permissions are introduced.

• Base master SHA: c2b2a3ed1ddd7a2d8b39ff16e3e6d9b8ce419f90.
• Source commit: b9982f1b96240a08d5f1a3d2c2d0cf04139f4926; source tree: 0406a3020f86e405b7934ea50764d0f7e64ee63d.
• Changed files: one new Markdown document, 217 added lines / 0 deleted lines; source Git blob f405414fbbdb6175c399b4938b0c50f7af577ba6.

Evidence and security boundary

• Existing H3 Python offline/synthetic tests: 107/107 PASS in the independent local clone.
• 48 native Windows security scenarios are specification/test cases only: NOT EXECUTED (42 P0 and 6 P1). No claim of native validation.
• Actual Windows ncalrpc RPC broker, verified current-call/AppContainer identity, owner-signed grants, witness and durable replay engine, protected memory reader/SQLite-WAL ACLs, service principal, and production enforcement remain UNIMPLEMENTED / UNVERIFIED.
• MODEL_ALLOW from Python fixtures is not runtime authorization. PRODUCTION HOLD; no live memory disclosure, Windows service, TPM, DPAPI, ACL, MCP, Scheduler or trading authority is enabled.
• Design covers pinned server proof, OS token checks, owner grant, replay PENDING_WITNESS, independently verified witness epoch, bounded read plan, durable pre-disclosure intent and failure/unknown-delivery handling. These are design requirements, not implemented controls.

Historical wording preserved

The source document's historical status lines, including UNTRACKED / NO COMMIT, remain verbatim and intentionally describe the earlier local design-DRAFT stage. They are not assertions about the current Git state; the source is now committed solely for draft review. This PR does not rewrite the document to remove or reconcile those historical lines.

Review constraints

DRAFT PR FOR REVIEW ONLY. No merge, deploy, branch deletion, extra commits, Windows/TPM/SQLite/MCP/Scheduler mutations, or production activation are authorized by this PR. Native feasibility/integration tests and separate owner decisions remain future gates.