fix: upgrade graphile ecosystem to latest RC versions with compatibility fixes

[pyramation]

Summary

Upgrades all graphile ecosystem packages to the latest compatible pinned RC versions and fixes breaking changes introduced in graphile-build-pg@5.0.0-rc.8.

Version Alignment

All graphile deps pinned (no ^) to the versions shipped with postgraphile@5.0.0-rc.10:

Package	Old	New
postgraphile	5.0.0-rc.7	5.0.0-rc.10
@dataplan/pg	1.0.0-rc.5	1.0.0-rc.8
grafast	1.0.0-rc.7	1.0.0-rc.9
graphile-build-pg	5.0.0-rc.5	5.0.0-rc.8
graphile-build	5.0.0-rc.4	5.0.0-rc.6
graphile-config	1.0.0-rc.5	1.0.0-rc.6
pg-sql2	5.0.0-rc.4	5.0.0-rc.5
graphile-utils	5.0.0-rc.5	5.0.0-rc.8
grafserv	1.0.0-rc.6	1.0.0-rc.7
tamedevil	0.1.0-rc.4	0.1.0-rc.6
@graphile-contrib/pg-many-to-many	2.0.0-rc.1	2.0.0-rc.2

Breaking Change Fixes

1. Null guards in custom-inflector.ts

graphile-build-pg@5.0.0-rc.8 now calls inflectors for ref-based relations where registry.pgRelations[codec.name]?.[relationName] returns undefined. Added null guards to singleRelation, singleRelationBackwards, _manyRelation, and _manyToManyRelation that fall back to PostGraphile's default behavior when the relation is undefined. Also fixed missing optional chaining on relation.extensions?.tags?.foreignFieldName.

2. tsvector codec compatibility in graphile-search

graphile-build-pg@5.0.0-rc.8 added built-in tsvector/tsquery support (crystal#2954) which:

• Uses TYPES.tsvector from @dataplan/pg (has extensions: { oid } but no extensions.pg)
• Hides tsvector columns by default via PgAttributesPlugin.HIDE_BY_DEFAULT

Fixed by:

• Updating isTsvectorCodec() to also match by codec.name === 'tsvector'
• Adding entity behavior to re-enable tsvector columns that rc.8 hides by default, so search plugins can detect and use them

3. Updated csv-to-pg test snapshots

The pgsql-deparser dependency was updated as part of the lockfile refresh, changing SQL output formatting. Updated 7 snapshots in export.test.ts to match the new deparser output.

Review & Testing Checklist for Human

• Verify tsvector search works end-to-end: The isTsvectorCodec() broadened check (codec.name === 'tsvector') and the entity behavior that re-enables hidden tsvector columns are the riskiest changes. Run the graphile-search and graphile-settings test suites locally to verify tsvTsv filter fields appear correctly.
• Verify custom inflector null guards don't affect naming: The return previous!(details) fallback delegates to PostGraphile defaults for ref-based relations. Check that relation field names in the generated schema haven't changed unexpectedly.
• Spot-check the lockfile: The pnpm-lock.yaml changes are large. Verify no duplicate graphile package versions are resolved (the original bug was caused by rc.5 and rc.8 of @dataplan/pg coexisting).
• Review csv-to-pg snapshot diff: The snapshot changes should be purely formatting (from pgsql-deparser update). Verify the SQL semantics are unchanged.

Notes

• CI: 42/42 checks pass (all green).
• The TsvectorCodecPlugin gather hook is now effectively a no-op on rc.8+ (the built-in PgCodecsPlugin handles tsvector first), but is kept for backward compatibility.
• Version compatibility confirmed via the postgraphile@5.0.0-rc.10 changelog.

Link to Devin session: https://app.devin.ai/sessions/7dae13db67bc4cc9b971e75984be2187
Requested by: @pyramation