Add SSE heartbeat to prevent Cloudflare idle timeout disconnections

Merge feature/chaos-queue-panel into main

Fix case-sensitive log assertion in integration tests

Add tests for chaos queue and extract text utilities

Add Chaos Queue Panel for visual triage workflow

Add witness guide and philosophy docs

Fix tunnel primary machine hostname instability and stale MCP sessions

Add docs/.private/ to gitignore for private feature specs

Add orama-worker.js and embedding-worker.js to gitignore

Add smart-quote path normalisation for MCP file tools

Add debug logging to triage tools and fix cache listener timing

Bump version to v0.12.0

Add page preview, document session, and polish contextual search

Add contextual search mode and fix triage cache race

Document re-ranking feature, idle threshold, and session learnings