Constraint walker and polarity analysis

- 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)

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