fix(generate-docs): produce Biome-compatible JSON output

The generator wrote multi-line arrays for short string arrays (like tags)
and omitted trailing newlines, causing Biome format check failures in CI.
Post-process integrations.json to collapse short arrays onto single lines
and add trailing newlines to both integrations.json and meta.json.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: waleedlatif1