feat: add notesmd-cli package and flake checks

- Add notesmd-cli package for Obsidian CLI interaction
- Add flake checks for package build verification
- Add documentation for notesmd-cli, sidecar, and td
- Update AGENTS.md to reference td instead of beads
- Format pkgs/default.nix with proper braces

AGENTS.md

@@ -5,8 +5,8 @@
 You must run td usage --new-session at conversation start (or after /clear) to see current work.
 Use td usage -q for subsequent reads.
 
-**Generated:** 2026-01-13
-**Commit:** 366af12
+**Generated:** 2026-02-14
+**Commit:** dc2f3b6
 **Branch:** master
 
 ## OVERVIEW
@@ -155,16 +155,16 @@ Types: `feat`, `fix`, `docs`, `style`, `refactor`, `chore`
 - **Dev shell tools**: `statix`, `deadnix` only available inside `nix develop`
 - **Automated package updates**: Packages are automatically updated weekly via Gitea Actions using `nix-update`. Review PRs from the automation before merging. For urgent updates, manually run the workflow or update manually.
 
-## Issue Tracking
+## Task Management
 
-This project uses **bd (beads)** for issue tracking.
-Run `bd prime` for workflow context, or install hooks (`bd hooks install`) for auto-injection.
+This project uses **td** for tracking tasks across AI coding sessions.
+Run `td usage --new-session` at conversation start to see current work.
+Use `td usage -q` for subsequent reads.
 
 **Quick reference:**
 
-- `bd ready` - Find unblocked work
-- `bd create "Title" --type task --priority 2` - Create issue
-- `bd close <id>` - Complete work
-- `bd sync` - Sync with git (run at session end)
+- `td usage --new-session` - Start new session and view tasks
+- `td usage -q` - Quick view of current tasks (subsequent reads)
+- `td version` - Check version
 
-For full workflow details: `bd prime`
+For full workflow details, see the [td documentation](./docs/packages/td.md).