ci(postgrest-typegen): drop the nightly parity job against postgres-meta

[spydon]

Why

The scheduled "Parity vs. real postgres-meta" job in postgrest-typegen-validate.yml has failed every night since 2026-09-10 (SDK-1847). The ticket assumed postgres-meta had changed its Python template after the cutover. It is the other way around: postgres-meta deleted its templates in supabase/postgres-meta#1084 (postgres-meta v0.99.0, 2026-08-31) and now consumes @supabase/postgrest-typegen, with its lockfile pinned to 0.2.0.

The job therefore diffs main against our own 0.2.0 release as installed by postgres-meta's npm ci. Every intentional generator change since then shows up as "drift":

• Python JsonValue, typing_extensions imports, and Optional[...] composite attributes (fix(postgrest-typegen): python escaping, 3.9 imports, JsonValue json columns, composite nullability #124, released in 0.2.1). In the diff, the - lines are postgres-meta's output and the + lines are ours.
• TypeScript fixed-collation ordering (fix(postgrest-typegen): order generated output with a fixed collation #181, released in 0.2.2), which started failing today's run as well.

There is no independent upstream left to compare against. Comparing against postgres-meta only measures how far behind its pinned version is, and postgres-meta's own snapshot tests cover its adapter.

What

• Remove the parity-check job and the schedule and workflow_dispatch triggers that only existed for it; the remaining test job runs on push and pull requests as before.
• Delete scripts/load-fixtures.ts, scripts/print-generated.ts, and scripts/canonicalize-typescript.ts, which only served that job, and drop their knip entries.
• Replace the "Byte-Parity Constraint" section in the package CLAUDE.md with a description of the post-cutover relationship (this package is the single source of truth; output changes are behavior changes for postgres-meta and the CLI, reviewed via the regenerated snapshots and goldens). Adjust the README and the golden test's doc comment to match. The prettier pin note was already stale since the package has no prettier dependency.

The golden test under test/parity/ and its expected/ files stay as the in-repo regression gate.

Verification

bun run check-types, bun run format-and-lint, bun run knip, and bun run test (134 tests, including the testcontainers-backed golden test) pass locally.

Closes SDK-1847.

[coderabbitai]

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