[carldaws]

• Replace DDL allowlist with dynamic interception: Instead of maintaining a hand-curated list of DDL methods to intercept, the adapter now discovers all SchemaStatements methods whose first parameter contains "table" and wraps them automatically. A small skip list (create_join_table, drop_join_table) covers methods where the first argument isn't the target table. New Rails methods are intercepted by default — no list to go stale.
• Copy constraints during shadow: LIKE ... INCLUDING ALL EXCLUDING INDEXES doesn't copy foreign keys (Postgres design), exclusion constraints, or unique constraints (both index-backed). The shadow now replays these from pg_constraint after the data copy, using pg_get_constraintdef verbatim — no string rewriting needed since the definitions resolve correctly via search_path.
• Drop table tombstoning: drop_table on a branch previously left the table visible via search_path fallthrough to public, corrupting schema.rb. Now creates a lightweight tombstone (structure-only, no data) in a __dropped schema that blocks fallthrough. The schema dumper excludes tombstoned tables. create_table after drop_table removes the tombstone.
• Enum DDL shadowing: drop_enum, rename_enum, add_enum_value, and rename_enum_value now copy the enum type from public to the branch schema before applying the change, preventing silent mutation of public enums.
• Comprehensive DDL test suite: 40+ new tests covering every table DDL method, enum DDL, constraint preservation, drop semantics, and structural equivalence. A meta-test ensures every SchemaStatements method with a table parameter either has a test or is explicitly skipped — new Rails methods cause a test failure, not a silent gap.

Test plan

• Full suite passes: 124 runs, 274 assertions, 0 failures
• Existing tests unmodified (except one search_path assertion updated for the dropped schema)
• Verify drop_table on a branch no longer appears in schema.rb
• Verify enum DDL on a branch doesn't modify public enums
• Verify FK, exclusion, and unique constraints survive shadowing