Align custom agent instructions contract

[leo-paz]

Summary

• remove deprecated custom-agent surfaceCriteria / skipCriteria CLI inputs
• document unified custom-agent instructions guidance
• update the docs OpenAPI contract for custom agent create/detail schemas and route coverage

Verification

• bunx biome check --write docs/ai-integrations/platform-actions.mdx docs/cli/commands.mdx docs/openapi.json packages/cli/src/commands/agents/create.ts packages/cli/src/commands/agents/index.ts packages/cli/src/commands/completions.ts packages/cli/tests/commands/agents/create.test.ts packages/cli/tests/commands/platform-lifecycle.test.ts packages/cli/tests/lib/client.test.ts tests/docs/openapi-spec.test.ts
• bun run typecheck
• bun test tests/docs/openapi-spec.test.ts packages/cli/tests/commands/agents/create.test.ts packages/cli/tests/commands/platform-lifecycle.test.ts packages/cli/tests/lib/client.test.ts
• bun run lint (returns 0; cached logs still show an existing Biome panic on packages/core/dist/index.js)

Core dependency

This PR should be merged before the Core staging -> main PR is expected to pass SDK OpenAPI drift checks.

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Review details

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between aa07bfa and 2a4f8e4.

📒 Files selected for processing (11)

• .changeset/custom-agent-unified-instructions.md
• docs/ai-integrations/platform-actions.mdx
• docs/cli/commands.mdx
• docs/openapi.json
• packages/cli/src/commands/agents/create.ts
• packages/cli/src/commands/agents/index.ts
• packages/cli/src/commands/completions.ts
• packages/cli/tests/commands/agents/create.test.ts
• packages/cli/tests/commands/platform-lifecycle.test.ts
• packages/cli/tests/lib/client.test.ts
• tests/docs/openapi-spec.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/custom-agent-unified-instructions

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