Add missing repository components for complete supercharge.sh installation

Added all directories and files expected by supercharge.sh:

- hooks/ (5 hook scripts for session management and AI consultation)
- commands/ (3 custom slash commands: brainstorm, write-plan, execute-plan)
- plugins/ (plugin references for glm-plan, rust-analyzer, marketplaces)
- bin/ralphloop (Ralph Orchestrator wrapper for autonomous iteration)
- scripts/sync-agents.sh (agent synchronization script)
- templates/ (config templates: settings, hooks, config.json)

This completes the repository structure so supercharge.sh can install
all components without warnings.

Co-Authored-By: Claude <noreply@anthropic.com>

commands/execute-plan.md

@@ -0,0 +1,52 @@
+# /execute-plan
+
+Execute a previously created implementation plan.
+
+## Usage
+
+```
+/execute-plan
+/execute-plan my-plan.md
+/execute-plan --review
+```
+
+## Description
+
+Executes implementation plans created with `/write-plan`:
+- Reads plan from `.claude/plans/`
+- Executes each step in order
+- Creates checkpoints for rollback
+- Validates each step completion
+
+## Options
+
+```
+--review      # Review plan before executing
+--from=N      # Start from step N
+--to=N        # Execute through step N
+--dry-run     # Show what would be done
+--continue    # Continue after error
+```
+
+## Execution Process
+
+1. **Load Plan** - Read and parse plan file
+2. **Review** (optional) - Show steps and confirm
+3. **Execute** - Run each step sequentially
+4. **Validate** - Verify each step completed
+5. **Checkpoint** - Save progress after each step
+6. **Report** - Summary of changes
+
+## Examples
+
+```
+/execute-plan                    # Execute latest plan
+/execute-plan auth-plan.md       # Execute specific plan
+/execute-plan --review           # Review before executing
+/execute-plan --from=5           # Start from step 5
+```
+
+## Checkpoints
+
+Each step creates a checkpoint in `.claude/plans/<plan-name>.checkpoint/`
+Use `--continue` to resume from last checkpoint after failure.