feat: generate agent skills from SDK codegen

[pyramation]

Summary

Runs the three SDK generation scripts (sdk/constructive-sdk, sdk/constructive-react, sdk/constructive-cli) which all had docs: { skills: true } configured but had never been executed. This produces 12 new skill directories under .agents/skills/:

Skill	Generator	Tables	Custom Ops
orm-admin	ORM	32	13
orm-auth	ORM	7	20
orm-objects	ORM	5	12
orm-public	ORM	107	55
hooks-admin	React Query	32	13
hooks-auth	React Query	7	20
hooks-objects	React Query	5	12
hooks-public	React Query	107	55
cli-admin	CLI (csdk)	32	13
cli-auth	CLI (csdk)	7	20
cli-objects	CLI (csdk)	5	12
cli-public	CLI (csdk)	107	55

Each skill directory contains a SKILL.md with usage/examples and a references/ folder with per-entity documentation. The app target was correctly skipped (empty schema). No source code or configuration was changed — only generated markdown was added.

Review & Testing Checklist for Human

• Spot-check a few generated skill files — verify the ORM usage examples, CLI commands, and React Query hook patterns look correct for entities you know well (e.g. orm-public/references/database.md, cli-auth/references/user.md)
• Verify no non-skill files were accidentally committed — git diff --stat should show only files under .agents/skills/
• Confirm the existing hand-written constructive-monorepo-setup skill was not modified

Notes

• All files are auto-generated by @constructive-io/graphql-codegen (marked with <!-- DO NOT EDIT --> comments). The codegen itself was not modified.
• These skills will need regeneration when schemas change — this is the expected workflow per the codegen design.

Link to Devin session: https://app.devin.ai/sessions/993406dc4ad949f68f211e4b448306de
Requested by: @pyramation

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