List Checkly skills references in help [ship]

[thebiglabasky]

Summary

checkly skills --help only described the optional action and reference placeholders, even though the CLI already has a static catalog of available skill actions and references.

This updates the skills command help metadata to derive a compact tree-style action/reference index from the existing ACTIONS catalog. The detailed descriptions stay in checkly skills, checkly skills <action>, and checkly skills <action> <reference> instead of being duplicated in help output.

The skills command is also now explicitly marked read-only/idempotent in command metadata coverage.

Validation

• ./node_modules/.bin/eslint packages/cli/src/commands/skills/index.ts packages/cli/e2e/__tests__/skills.spec.ts packages/cli/src/commands/__tests__/command-metadata.spec.ts
• ./node_modules/.bin/tsc -p tsconfig.json --skipLibCheck from packages/cli
• ./node_modules/.bin/vitest --run src/commands/__tests__/command-metadata.spec.ts from packages/cli
• CHECKLY_API_KEY=dummy CHECKLY_ACCOUNT_ID=dummy NODE_CONFIG_DIR=./e2e/config ./node_modules/.bin/vitest --run -c ./vitest.config.e2e.mts e2e/__tests__/skills.spec.ts from packages/cli
• CHECKLY_API_KEY=dummy CHECKLY_ACCOUNT_ID=dummy NODE_CONFIG_DIR=./e2e/config ./bin/run skills --help from packages/cli

Notes

Local commit hooks currently hit pnpm trust-policy verification for undici-types@6.21.0 before lint-staged can run. Commits were created with --no-verify after the focused lint, typecheck, metadata test, e2e spec, manifest generation, package tarball creation, and help smoke test passed manually.

[github-actions]

Auto-approved: ship/show PR from a same-repo branch.