fix: add npm discovery metadata for 0.1.2

[replynodes-ai]

Summary

• Add truthful npm discovery keywords to @replynodes/brand-kit.
• Bump package metadata and lockfile root to 0.1.2, preserving the brand-kit binary and CLI behavior.
• Document the immutable 0.1.2 replacement for published 0.1.1.

Verification

• npm ci — passed
• npm run smoke — passed (live endpoint check for linear.app)
• npm run package-shape — passed
• npm pack --dry-run --json — passed; @replynodes/brand-kit@0.1.2, 11 files
• node --check src/cli.mjs — passed
• node --check bin/brand-kit.mjs — passed
• node --check scripts/smoke.mjs — passed
• JSON syntax checks for package.json and package-lock.json — passed
• git diff --check — passed

No unit tests added or run, per task scope.

[replynodes-ai]

Independent review follow-up for PR #4 exact head 57c9031839148072a901e0cde6a6875eed3084c7: PASS after stale changelog correction.

Verified keywords are truthful, scoped package/bin/version/lockfile are consistent, @replynodes/brand-kit@0.1.1 is accurately marked published/current, 0.1.2 is accurately marked unpublished replacement, smoke/package-shape/syntax/JSON/diff checks pass, and no unit tests were added.