feat(integrations): add /plan-to-beads Claude Code command

Add slash command that converts Claude Code plan files into beads
epics with tasks and dependencies.

Features:
- Parses plan structure (title, summary, phases)
- Creates epic + tasks from phases
- Sets up sequential dependencies
- Uses Task agent delegation for context efficiency

Complements existing bd prime hooks for session start/end.

integrations/claude-code/README.md

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+# Claude Code Integration for Beads
+
+Slash command for converting [Claude Code](https://docs.anthropic.com/en/docs/claude-code) plans to beads tasks.
+
+## Prerequisites
+
+```bash
+# Install beads
+curl -fsSL https://raw.githubusercontent.com/steveyegge/beads/main/scripts/install.sh | bash
+
+# Install hooks (auto-injects workflow context on session start)
+bd setup claude
+```
+
+## Installation
+
+```bash
+cp commands/plan-to-beads.md ~/.claude/commands/
+```
+
+Optionally add to `~/.claude/settings.json` under `permissions.allow`:
+
+```json
+"Bash(bd:*)"
+```
+
+## /plan-to-beads
+
+Converts a Claude Code plan file into a beads epic with tasks.
+
+```
+/plan-to-beads                    # Convert most recent plan
+/plan-to-beads path/to/plan.md    # Convert specific plan
+```
+
+**What it does:**
+- Parses plan structure (title, summary, phases)
+- Creates an epic for the plan
+- Creates tasks from each phase
+- Sets up sequential dependencies
+- Uses Task agent delegation for context efficiency
+
+**Example output:**
+```
+Created from: peaceful-munching-spark.md
+
+Epic: Standardize ID Generation (bd-abc)
+  ├── Add dependency (bd-def) - ready
+  ├── Create ID utility (bd-ghi) - blocked by bd-def
+  └── Update schema (bd-jkl) - blocked by bd-ghi
+
+Total: 4 tasks
+Run `bd ready` to start.
+```
+
+## Related
+
+- `bd prime` - Workflow context (auto-injected via hooks)
+- `bd setup claude` - Install/manage Claude Code hooks
+- `bd ready` - Find unblocked work
+
+## License
+
+Same as beads (see repository root).