Summary

semantic-diff-driver.ts now composes revert/verify at the AST level via the node API published in @pgsql/scripts@18.1.0 (pgsql-parser#328), instead of round-tripping through deparsed text:

// per statement, reverse topo order:
const nodes = invertStatement(fact);        // AnyNode[] | null (null = not derivable)
if (nodes === null) {
  // fall back to revertFor([fact]) only to surface the
  // "-- revert not derivable: <reason>" comment + warning
} else {
  pieces.push(...nodes.map(deparseStmt));   // deparse once
}

const checks = existenceCheck(fact);        // SelectStmt nodes | null

Prior-state inversion (DROP COLUMN re-add, ALTER TYPE back, etc.) stays in the semantic differ via swapped-side diffs — @pgsql/scripts remains strictly "invertible from the deploy alone".

Now depends on the published @pgsql/scripts@^18.1.0 and pgsql-deparser@18.2.0 (the temporary .tarballs/ and pnpm override used during development have been removed).

Tests: pgpm/transform 60/60, pgpm/export granularity e2e 10/10 against the published packages.

Refs constructive-planning#1329 (Phase 4 follow-up).

Link to Devin session: https://app.devin.ai/sessions/7f032c8e1bf245eeac2def99fdcc1623
Requested by: @pyramation