docs: update README to v5 architecture with Lark webhook, signal sources, Discord routing

feat: v5 engine full sync from production — Lark webhook, new routing, config system

fix: repair manifest.yaml, update README and intent.md for new UI

feat: add Action field with emoji to signal embed

feat: update Discord embed UI - new signal card layout

feat(discord-ux-v3): thread-based drafts + context modal + feedback system

fix(interaction): ephemeral followUp drafts, tone index in customId

fix(skill-engine): make package.json patch deterministic and portable

feat: add package.json postbuild sync to manifest

fix: fix double @ in author display, rename Confidence to Alert Confidence

fix: read polling_interval_minutes from config.yaml in collector cron script

fix: update skill for compatibility with skills-engine

docs: update README for skill engine format

refactor: restructure to NanoClaw skill engine format

fix(collector): use grok-4-1-fast-non-reasoning for xai_search adapter