feat(continuity): expose reviewed CLI and dogfood

[szmyty]

Summary

• expose deterministic continuity plan/preview/apply/verify/rollback commands with an exact preview receipt, reviewed plan ID, JSON result contracts, and externally stored planning artifacts
• harden rollback with under-lock state-digest approval and failure-atomic compensation
• dogfood provisional root AGENTS.md / CONTINUITY.md / state materialization and CI parity proof, with architecture and roadmap traceability

Validation

• python3 -m compileall -q tools tests
• python3 -m unittest discover --start-directory tests --pattern "test_*.py" --verbose — 127 passed
• npm test — 18 passed
• continuity profile validation and all 16 pinned source artifacts verified
• cross-repository fixtures — all five profiles plus Antidote passed
• root dogfood — exact parity, no Git/network/provider commands
• React/Vite, LaunchKit, repository-presentation, and Zensical/site-suite contract validators passed
• hosted CI owns the exact Cargo build and pnpm 11.24 clean-room checks; those exact toolchains were unavailable locally

Release gate

This PR does not promote the proposed observe-stage profile. The Aether, Hygiene, and EgoLint inputs remain unreleased, EgoLint #55 remains open, and parent #42 therefore remains blocked.

Closes #46
Refs #42
Roadmap-Step: HOL-Q08
ADR-Ref: ADR-010

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