docs: add Brand Kit discovery surfaces

[replynodes-ai]

Summary

• Add root SKILL.md and machine-readable llms.txt for task-intent discovery.
• Add exactly five reproducible intent examples and use the published scoped command npx @replynodes/brand-kit <bare-domain>.
• Preserve the v0.1 contract: one aggregate GET, six local artifacts, reference-only assets, no credentials.

Ownership

This PR owns CLI-facing discovery artifacts in replynodes/brand-kit for issue #563. The canonical docs guide and generated docs are owned by companion replynodes-fetcher PR #586.

Verification

• npm run smoke
• Node syntax checks
• npm pack --dry-run
• Markdown/machine-discovery smoke validation
• git diff --check
• secret scan of changed discovery files

The package is now published as @replynodes/brand-kit; no additional npm claim or unscoped package is used. No deploy performed.

[replynodes-ai]

Scoped package migration follow-up: #3

This draft remains on its original discovery branch; the migration PR is the source of truth for the approved @replynodes/brand-kit v0.1.1 command and preserves brand-kit as the executable.

[replynodes-ai]

Architect readback: the exact heads remain verified after scoped migration:

• Public PR docs: add Brand Kit discovery surfaces #2 60d64112ae419e781c843a3146f2b075f318f61e: five discovery examples, SKILL/llms/README, scoped @replynodes command, live smoke/package/docs checks, no tests.
• Private PR #586 4cb2d651c21a614491f3f3e05bb3d5d14bb8bfbe: canonical docs guide/navigation/generated docs, scoped command, docs generators/validators/lint/secret scan/diff pass, no routes/tests.

The public package is now published as @replynodes/brand-kit and the docs bodies were read back with no stale unscoped publication claim.