Unify Cogito and document analysis with resilient local workflows

[feddernico]

Summary

• combine Document Linter and Cogito into one writing-assistance panel
• show document strength, priorities, and section feedback inside Cogito
• use linter findings to focus Cogito’s three coaching questions
• remove the standalone Linter button and panel
• debounce automatic analysis and bound model prompt context
• move WebLLM caching to IndexedDB
• repair failed model caches and retry Lite or fall back from Deep to Lite
• improve workspace scanning with bounded concurrency and one read per file
• prioritize note opening over background scans
• idle-gate and reduce automatic workspace refreshes

Testing

• npm run build
• npm run test:qunit — 88 passing
• full Cypress suite — 57 passing
• focused Cogito tests — 4 passing
• focused workspace tests — 8 passing
• strict OpenSpec validation