fix: harden upstream sync recovery - #3
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The crash-recovery path could mistake a reused PID for a live sync and could wedge forever when a user edited a target after a crash. This PR records host/platform/process-start identity, fails closed for unverifiable cross-runtime owners, quarantines unexpected user edits before rollback, treats COMMITTED as authoritative for cleanup, and validates reserved journal targets and takeover initializers. README documents serialized readers and Windows process-crash-only durability. Verification: npm test (72 pass, 1 existing Unix-only skip); WSL Node 18 sync tests (24 pass); npm run check-package; npm pack --dry-run; git diff --check.\n\n---\nAgent: GPT-6 via Codex