Make savings reporting honest and add workflow guidance

[igal2004]

Summary

• make savings reporting more transparent by separating measured savings from estimated context reuse, workflow guidance, and session hygiene
• add reusable workflow helpers including /bundle, /brief, saved file briefs, and a session reset advisor
• expand the dashboard with a new Token Hygiene Guide, clearer platform/support messaging, and a real live dashboard sharing flow

What Changed

• introduced Prompt Bundler to combine related asks into one structured prompt without aggressive rewriting
• introduced Reusable File Briefs with stale detection and selective brief injection when a file is mentioned again
• introduced Session Reset Advisor based on turns, elapsed time, and accumulated tokens
• updated the feature catalog and dashboard taxonomy so measured savings stay separate from guidance-only recommendations
• added a dedicated Token Hygiene Guide section to the dashboard with dynamic recommendations tied to live session state
• tightened CLI/docs wording so supported platforms and savings claims stay honest
• added ccso --share-dashboard support and tunnel URL extraction helpers

Validation

• node tests/test.js
• node --check src/index.js
• node --check src/dashboard/server.js
• node --check bin/cc.js
• inline dashboard script syntax check via new Function(...)