feat: Add ancestor_id field and implement epic/child filtering

Amp-Thread-ID: https://ampcode.com/threads/T-22f7d7c5-6f7b-4783-beda-8494360d887a
Co-authored-by: Amp <amp@ampcode.com>

commands/list.md

@@ -5,23 +5,57 @@ argument-hint: [--status] [--priority] [--type] [--assignee] [--label]
 
 List beads issues with optional filtering.
 
-## Filters
+## Basic 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)
+- **--label-any**: Filter by labels (OR semantics, must have AT LEAST ONE)
 - **--title**: Filter by title text (case-insensitive substring match)
 - **--limit, -n**: Limit number of results
 
+## Advanced Filters
+
+### Pattern Matching
+- **--title-contains**: Search for text in title (case-insensitive)
+- **--desc-contains**: Search for text in description (case-insensitive)
+- **--notes-contains**: Search for text in notes (case-insensitive)
+
+### Date Ranges
+- **--created-after**: Issues created after date (YYYY-MM-DD or ISO 8601)
+- **--created-before**: Issues created before date
+- **--updated-after**: Issues updated after date
+- **--updated-before**: Issues updated before date
+- **--closed-after**: Issues closed after date
+- **--closed-before**: Issues closed before date
+
+### Priority Range
+- **--priority-min**: Minimum priority (inclusive)
+- **--priority-max**: Maximum priority (inclusive)
+
+### Empty/Null Checks
+- **--empty-description**: Find issues with no description
+- **--no-assignee**: Find unassigned issues
+- **--no-labels**: Find issues with no labels
+
 ## Examples
 
+### Basic Usage
 - `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
 
+### Advanced Usage
+- `bd list --title-contains "auth" --status open`: Search open issues for auth-related work
+- `bd list --priority-min 0 --priority-max 1`: Critical and high priority issues only
+- `bd list --created-after 2025-01-01 --status open`: Recent open issues
+- `bd list --empty-description --status open`: Open issues missing descriptions
+- `bd list --no-assignee --priority 1`: High priority unassigned work
+- `bd list --desc-contains "TODO" --notes-contains "review"`: Find items needing attention
+
 ## Output Formats
 
 - Default: Human-readable table