Self-review result: no blocking findings.

Open questions / assumptions:

• Assumes this remains a shadow validator for dry-run correctness packets only, not an actual local-state write/apply implementation.
• Assumes lease conflicts should be reported for same goal/todo lease refs with different holders; same-holder lease-id differences remain non-conflicting in this preview layer.

Product / architecture judgment:

• Motivation: local active-state writes need a public-safe preview surface that can detect stale revisions and lease ownership conflicts before any mutation path is touched.
• Solved: the PR adds shadow_validate_local_state_write_correctness_packet, which deep-copies a dry-run packet, computes current active-state revision, reports revision_conflict / lease_conflict, and leaves actual state writes unchanged. The smoke proves clean preview, revision conflict, lease conflict, idempotency stability, markdown projection, and that real todo writes do not expose the dry-run packet.
• User/operator impact: agents get a safer reviewable preflight for todo/local-state writes, reducing silent overwrite and stale-lease risk without adding production write behavior.
• Main risk: this is a preview validator, so callers must still wire it intentionally before relying on it. It does not replace file locks or actual write transaction checks.
• Design judgment: this is a reusable contract slice. During review I refined it by adding todo-write-correctness-smoke.py to the state-write-correctness catalog profile and asserting that wiring in the planner smoke, so the new shadow behavior is covered by the standard non-benchmark canary route.

Validation performed:

• python3 -m py_compile loopx/local_state_write_correctness.py loopx/canary/planner.py examples/todo-write-correctness-smoke.py examples/catalog-canary-planner-smoke.py examples/catalog-canary-run-e2e-smoke.py
• python3 examples/todo-write-correctness-smoke.py
• python3 examples/catalog-canary-planner-smoke.py
• python3 examples/catalog-canary-run-e2e-smoke.py
• python3 -m loopx.cli canary run --format json --profile state-write-correctness --max-checks-per-profile 3 --check-limit 3 --timeout-seconds 120 passed 3/3 and included todo-write-correctness-smoke.py.
• python3 -m loopx.cli canary coverage-audit --format json reported 28/28 covered, drift_count=0.
• python3 -m loopx.cli check --scan-path loopx/local_state_write_correctness.py --scan-path examples/todo-write-correctness-smoke.py --scan-path loopx/canary/planner.py --scan-path examples/catalog-canary-planner-smoke.py --limit 200 passed public/private boundary scan with one pre-existing duplicate-index warning.
• git diff --check origin/main...HEAD

Merge decision: approved for owner-authorized self-merge.