feat(wave13): kei-diff + kei-scheduler + kei-watch primitives
3 new primitives, registered in workspace members (39 crates total):
- kei-diff (9 files, 27 tests): Structural JSON diff RFC 6902 subset
(add/remove/replace). Pure computation. Index-based array diff
(not LCS) matches drift-detection semantics. Round-trip property
verified on 15+ fixtures. Zero sibling deps — pure utility.
- kei-scheduler (12 files, 16 tests): Durable task scheduler (cron /
at / interval) primitive. Engine-native (SCHEDULER_SCHEMA on
kei-entity-store). Name-unique via custom migration. compute_next
pure fn + CLI tick for external executor.
- kei-watch (12 files, 30 tests): Filesystem watcher thin wrapper
around notify 8.x. Sync API (no tokio). 50ms debounce. Cross-platform
rename handling (macOS Modify(Name(Both)) vs Linux From/To pair).
All crate-local [workspace] tables removed. Registered in
_primitives/_rust/Cargo.toml. cargo check --workspace clean.
Constructor Pattern: all source files <=200 LOC, all functions <=30 LOC.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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