fix(brief): use dynamic gh username for commit and PR filtering

fix(brief): tighter output, local timestamps, commit links in timeline

- Stripped to table + summary + projects + timeline + open threads.
- Commit links embedded in timeline entries.
- Converted commit and session timestamps to local time.
- Added non-interactive mode for pi -p with file-exists error.

feat(context-usage): show project name in footer

refactor: replace sub-agent system with standalone session-recall

- Remove extensions/sub-agent/ (runner, types, explore, recall tasks)
- Restore session-recall.ts from before the sub-agent refactor
- Sub-agent functionality now handled by nicobailon/pi-subagents

feat(obi): replace notesmd-cli obsidian skill with obi CLI

- Rename skill from obsidian to obi, matching the CLI name.
- Rewrite skill to use @butttons/obi for all vault operations.
- Add obi skill to README under Knowledge section.
- Bump to 1.6.0.

feat: add lazy-agents extension, obsidian skill, toggle commands for …

…guards

- Add lazy-agents.ts: on-demand AGENTS.md loading as agent touches subdirectories, deduped against startup-loaded files.
- Add obsidian skill for vault lookups via notesmd-cli and grep.
- Add Ctrl+Shift+E shortcut and toggle behavior to explore-guard.
- Add /tmux-redirect toggle command.
- Fix wrangler-ops D1 docs to reference database name, not binding name.

feat(sub-agent): add /sub-explore command for codebase exploration

- New explore task with read-only tools (read, list, grep, find) scoped to a target path.
- Register /sub-explore command with loader UI and message output.

fix(explore-guard): raise threshold to 10 and only count explore tools

- Increase default threshold from 4 to 10 to reduce false triggers.
- Filter tool_result to only count explore tools, not write/edit calls.

feat: add session-recall extension

- /recall <query> searches past sessions using TOON-formatted index with metadata (cost, duration, files touched, models).
- recall_session tool loads specific session conversations for the LLM.
- --compact flag strips filesTouched and compactionSummaries from index.