v0.0.9: adapter package, time stats, doctor command

[butttons]

Summary

Extract shared agent code into @residue/adapter, add time-based analytics to the dashboard, and introduce residue doctor for fixing orphaned sessions.

Changes

@residue/adapter (new internal package)

• Extract agent mappers, search text extractors, and metadata extractors from CLI and worker into shared @residue/adapter package
• Add extractTimestamps() utility that derives first/last message timestamps from any agent's raw session data

@residue/cli

• Add residue doctor command to retroactively link orphaned sessions to recent commits
• Send first/last message timestamps during sync for accurate duration tracking

@residue/worker

• Add time stats cards (total hours, avg/median/longest duration) to all dashboard pages
• Add hour-of-day vertical bar chart with morning/afternoon/evening/night bands
• Add day-of-week horizontal bar chart
• Add daily activity line chart to repo page
• Add migration 0007 for first_message_at/last_message_at columns on sessions
• Use message timestamps for duration calculations with wall-clock fallback

Docs

• Update AGENTS.md and CONTRIBUTING.md for the adapter package structure