chore: restore .claude commands, agents, helpers & skills (lost in 1df208d)

Restores the entire .claude/ infrastructure that was accidentally deleted
in commit 1df208d ('feat(timeline): add pulse animation for in-flight drag
mutations'). Recovered via git checkout 1df208d^.

Restored:
- .claude/commands/ (gitlooper, sparc/, github/, automation/, monitoring/,
  optimization/, hooks/, plan, implement, research, review, perf, visualaudit)
- .claude/agents/ (core/, github/, sparc/, v3/, swarm/, templates/, ...)
- .claude/helpers/ (41 scripts incl. hook-handler.cjs, statusline.cjs)
- .claude/skills/ (20 skills incl. sparc-methodology, github-*, v3-*)
- .claude/settings.json (hooks configuration)

Also updated all CapaKraken → Nexus references in affected command files.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/commands/hooks/pre-edit.md

@@ -0,0 +1,113 @@
+# hook pre-edit
+
+Execute pre-edit validations and agent assignment before file modifications.
+
+## Usage
+
+```bash
+npx claude-flow hook pre-edit [options]
+```
+
+## Options
+
+- `--file, -f <path>` - File path to be edited
+- `--auto-assign-agent` - Automatically assign best agent (default: true)
+- `--validate-syntax` - Pre-validate syntax before edit
+- `--check-conflicts` - Check for merge conflicts
+- `--backup-file` - Create backup before editing
+
+## Examples
+
+### Basic pre-edit hook
+
+```bash
+npx claude-flow hook pre-edit --file "src/auth/login.js"
+```
+
+### With validation
+
+```bash
+npx claude-flow hook pre-edit -f "config/database.js" --validate-syntax
+```
+
+### Manual agent assignment
+
+```bash
+npx claude-flow hook pre-edit -f "api/users.ts" --auto-assign-agent false
+```
+
+### Safe editing with backup
+
+```bash
+npx claude-flow hook pre-edit -f "production.env" --backup-file --check-conflicts
+```
+
+## Features
+
+### Auto Agent Assignment
+
+- Analyzes file type and content
+- Assigns specialist agents
+- TypeScript → TypeScript expert
+- Database → Data specialist
+- Tests → QA engineer
+
+### Syntax Validation
+
+- Pre-checks syntax validity
+- Identifies potential errors
+- Suggests corrections
+- Prevents broken code
+
+### Conflict Detection
+
+- Checks for git conflicts
+- Identifies concurrent edits
+- Warns about stale files
+- Suggests merge strategies
+
+### File Backup
+
+- Creates safety backups
+- Enables quick rollback
+- Tracks edit history
+- Preserves originals
+
+## Integration
+
+This hook is automatically called by Claude Code when:
+
+- Using Edit or MultiEdit tools
+- Before file modifications
+- During refactoring operations
+- When updating critical files
+
+Manual usage in agents:
+
+```bash
+# Before editing files
+npx claude-flow hook pre-edit --file "path/to/file.js" --validate-syntax
+```
+
+## Output
+
+Returns JSON with:
+
+```json
+{
+  "continue": true,
+  "file": "src/auth/login.js",
+  "assignedAgent": "auth-specialist",
+  "syntaxValid": true,
+  "conflicts": false,
+  "backupPath": ".backups/login.js.bak",
+  "warnings": []
+}
+```
+
+## See Also
+
+- `hook post-edit` - Post-edit processing
+- `Edit` - File editing tool
+- `MultiEdit` - Multiple edits tool
+- `agent spawn` - Manual agent creation