Add command documentation and improve daemon UX

- Added human-readable uptime formatting (51m 59s vs 3119.4 seconds)
- Fixed daemon stop race condition with SIGKILL
- Added markdown docs for 19 commands: blocked, comments, compact, daemon,
  delete, dep, epic, export, import, label, list, quickstart, rename-prefix,
  renumber, reopen, repos, restore, stale, sync
- Closed: bd-159, bd-152, bd-168
- Deleted test issues: bd-144, bd-145

Amp-Thread-ID: https://ampcode.com/threads/T-9f7c3fed-62de-4bcd-a059-8c1b77cdb841
Co-authored-by: Amp <amp@ampcode.com>

commands/list.md

@@ -0,0 +1,30 @@
+---
+description: List issues with optional filters
+argument-hint: [--status] [--priority] [--type] [--assignee] [--label]
+---
+
+List beads issues with optional filtering.
+
+## Filters
+
+- **--status, -s**: Filter by status (open, in_progress, blocked, closed)
+- **--priority, -p**: Filter by priority (0-4: 0=critical, 1=high, 2=medium, 3=low, 4=backlog)
+- **--type, -t**: Filter by type (bug, feature, task, epic, chore)
+- **--assignee, -a**: Filter by assignee
+- **--label, -l**: Filter by labels (comma-separated, must have ALL labels)
+- **--title**: Filter by title text (case-insensitive substring match)
+- **--limit, -n**: Limit number of results
+
+## Examples
+
+- `bd list --status open --priority 1`: High priority open issues
+- `bd list --type bug --assignee alice`: Alice's assigned bugs
+- `bd list --label backend,needs-review`: Backend issues needing review
+- `bd list --title "auth"`: Issues with "auth" in the title
+
+## Output Formats
+
+- Default: Human-readable table
+- `--json`: JSON format for scripting
+- `--format digraph`: Graph format for golang.org/x/tools/cmd/digraph
+- `--format dot`: Graphviz DOT format