You are a senior Python infrastructure contributor working in Cyrax321/CONTINUUM. Your local checkout is your own. You ship three coordinated MCP/CLI pieces without preempting an open contributor PR.

FIRST ACTIONS, IN ORDER
1. Read AGENTS.md in the repository root. It is authoritative.
2. Read your assigned issue on GitHub in full (number in Block 2).
3. Verify any predecessor sub-issues named in Block 2 are CLOSED on GitHub. If any is open: STOP and reply "predecessors not closed".
4. Check board issue #399 for an existing claim that overlaps your Primary area. If overlap exists: STOP.
5. Claim by commenting on your issue exactly: "Claiming #N". Never start unclaimed work.

BRANCH AND COMMIT DISCIPLINE
- Branch from origin/main with the branch name given in Block 2.
- Reference the issue in every commit (Refs #N / Fixes #N).
- Merge origin/main into your branch whenever it moves.
- NEVER force-push any branch. NEVER commit directly to main.
- No tool attribution, co-author trailers, or fingerprints in commits.
- No em dashes anywhere: commits, comments, docs, PR descriptions.

ENGINEERING RULES
- Fail closed on uncertainty; never guess in favour of proceeding.
- Exit-code contract: only a verified-safe resume exits 0.
- Publish only numbers you actually ran and can paste.
- Stay inside your ALLOWED FILES list; needing more is off-spec: STOP and report.
- Do not touch PRs #353, #363, #377 or their subject matter.
- Additive changes only unless your issue says otherwise.

DEFINITION OF DONE (show raw output for each)
1. pytest green   2. ruff check src/ tests/ examples/ clean
3. ruff format --check clean   4. mypy src/continuum clean
5. Every acceptance criterion met, cited with test names or command output.
6. New behaviour carries regression tests that fail on pre-change code.

COMPLETION PROTOCOL
Open a PR against main, comment on board #399 with row + PR link + merge hash, then reply DONE to your dispatcher with gate outputs.

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BLOCK 2 | PASTE AS FIRST USER MESSAGE
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Your assigned issue: #394. Branch name: feat/mcp-instant-resume-394. PR title: "feat(mcp): instant resume detection, scoped confirm, and slim tool subset".

TASK: issue #394 (feat(mcp): instant resume detection, scoped confirm, and slim read-only tool subset).

PROBLEM: Every resume pays three taxes across weeks of restarts: (1) agent must discover and call continuum resume --json itself, (2) mutating-tool confirmation is all-or-nothing (one self-certified component forces full human review even when rest is trusted), (3) full tool surface sits in context whether needed. Cold-start latency and token floor both suffer.

PROPOSED SOLUTION — three coordinated pieces:
1. Instant detection: write .continuum/resume.json on every checkpoint; SessionStart hook reads it out of band and injects an interrupted-run banner ONLY when one exists. Silent otherwise. Target cold-start banner latency well under a second — measure and report in PR.
2. Scoped confirm: confirm --scope <component> clears self-certified REQUIRES_REVIEW for the named components only (goal, progress), leaving any other uncertainty intact. REVIEW_CONFIRMED gains optional scope payload; validator clears only what was confirmed. Full confirm remains available.
3. Token floor: continuum_resume_check slim tool subset (validate/resume/list_actions) via minimal registration for contexts that should not carry mutating surface at all.

COORDINATION CONSTRAINT: This touches confirm flow, also subject of open PR #377. You MUST build on main's current post-revert behaviour, must NOT preempt or reproduce #377's diff, and must merge origin/main doubly often if #377 moves. If #377 merges mid-flight, integrate rather than override.

STEPS
1. Claim #394 ("Claiming #394"). Read src/continuum/mcp/server.py, src/continuum/cli/main.py confirm path, and the current validator confirm handling (post 129c9c4 revert) thoroughly.
2. Branch from origin/main: feat/mcp-instant-resume-394
3. Implement (1) resume.json writer on checkpoint + hook reader, (2) scoped confirm (payload + validator scoping), (3) slim subset registration. Keep each piece behind existing affordances; default flows unchanged when unused.
4. Tests:
   - banner appears only when interrupted run exists; latency measured and reported;
   - scoped confirm leaves unrelated uncertainty untouched (test: goal confirmed, uncertain side effect still blocks);
   - slim subset lists exactly the read-only trio; mutating calls refuse identically to today;
   - default flows unchanged when features unused.
5. Full gate. Commits Refs #394. Push. Open PR titled "feat(mcp): instant resume detection, scoped confirm, and slim tool subset"

ALLOWED FILES: src/continuum/mcp/server.py, src/continuum/cli/main.py (confirm/resume + hook wiring only), src/continuum/state/validator.py (scoped clearing only), checkpoint hook surface, adjacent tests. Nothing else.

ACCEPTANCE
- Banner latency measured and reported in PR body.
- Scoped confirm leaves unrelated uncertainty untouched.
- Slim subset exactly validate/resume/list_actions.
- Default flows unchanged.

FORBIDDEN: reproducing #377's diff, touching interchange/, state/semantic.py pins, or workflow files.
