docs: add bulk operations to auto-generated skills documentation

[pyramation]

Summary

Updates the codegen docs-generators so that auto-generated skill files (ORM, React Query hooks, CLI) include bulk operation documentation when tables have bulk mutations enabled via @behavior smart tags.

Changes to three docs-generators:

1. ORM docs-generator (graphql/codegen/src/core/codegen/orm/docs-generator.ts)

   • Models table now lists bulkCreate, bulkUpsert, bulkUpdate, bulkDelete when enabled
   • Per-table operations section includes bulk method examples
   • Skills reference files include bulk usage lines
   • SKILL.md overview mentions bulk methods when any table has them

2. Hooks docs-generator (graphql/codegen/src/core/codegen/hooks-docs-generator.ts)

   • Hooks table includes useBulkCreate*Mutation, useBulkUpsert*Mutation, etc. when enabled
   • Per-table hooks section includes bulk create example
   • AGENTS.md conventions line mentions bulk hooks
   • Skills reference files include bulk hook entries

3. CLI docs-generator (graphql/codegen/src/core/codegen/cli/docs-generator.ts)

   • Subcommand tables include bulk-create, bulk-upsert, bulk-update, bulk-delete when enabled
   • Skills reference usage includes bulk CLI command patterns
   • Multi-target README also includes bulk subcommands

All changes are conditional on table.query?.bulkInsert / bulkUpsert / bulkUpdate / bulkDelete — no output changes for tables without bulk enabled.

Review & Testing Checklist for Human

• Run pnpm test in graphql/codegen to verify all 347 tests pass (snapshot updated)
• Regenerate skills against a schema with @behavior +bulkInsert on a table and verify the bulk docs appear correctly in the generated output

Notes

Companion to constructive-io/constructive-db#1141 which adds DataBulk to the skill documentation in that repo.

Link to Devin session: https://app.devin.ai/sessions/b5701e74c8b44bbf89db370f3323acf2
Requested by: @pyramation

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