Co-authored-by: Estevan Castilho <tevo@riajuu.net>

- Polarity analysis walker on Constraint.t AST
- Cascade constraint re-checking on DELETE and INSERT
- Focused filtering to narrow re-checks to affected tuples only
- Universal variable substitution for targeted constraint re-evaluation
- Constant discovery for early bail-out (trigger_constants)
- Deferred constraint timing with commit boundary
- attach_constraint and commit API in Manipulation
- extend_tuple namespacing fix (variable.attr convention)
- History capping at 128 entries in Database.update_state
- Benchmark binary (bin/bench.ml)
- Design doc (docs/incremental_constraint_checking.org)

* file state hash calculation with history on replace and insert

* add state transitions with linear hashing

* add test

* format dune files

* nix format

* delete shared flake

* disable fmt check on flake

* add nix formatter to flake shell