No source implementation begins until this PR is merged and terminal-green. Tess ingress remains gated behind all M1 security prerequisites.
## Summary
- declares Tess as Mosaic W2 and preserves Mos as orchestration authority
- defines AgentRuntimeProvider and Pi GPT-5.6 Sol high service requirements
- adds architecture, threat model, verification matrix, migration inventory, manifest, scratchpad, and 26-task graph
- tracks milestones in #707-#711 under umbrella #706
## Planning evidence
- initial review BLOCKED on missing artifacts/path issues
- threat review identified seven prerequisite gateway/security risks
- two remediation rounds completed
- final independent gate PASS
- deterministic task-root audit: zero missing roots
- git diff --check PASS
## Safety
No source implementation begins until this PR is merged and terminal-green. Tess ingress remains gated behind all M1 security prerequisites.
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Summary
Planning evidence
Safety
No source implementation begins until this PR is merged and terminal-green. Tess ingress remains gated behind all M1 security prerequisites.