feat(audit): add todo for AI-powered code audit command

Adds a queued todo item outlining the `grokkit audit` feature for comprehensive code audits, including security, performance, and best practices analysis with actionable reports and fix previews.

todo/queued/audit.md

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+# `grokkit audit`
+**Description**: Comprehensive AI-powered code audit for security, performance, best practices, and potential bugs across single files or entire projects.
+
+**Benefits**:
+- Deep analysis beyond static linters: vulns (e.g., SQLi, race cond), perf hotspots, Go idioms violations.
+- Generates actionable report + diff previews for fixes.
+- Multi-language support (reuse testgen/lint patterns).
+- Boosts code quality/PR readiness.
+
+**High-level implementation**:
+- Detect lang/files (internal/linter), collect code snippets/context.
+- Prompt Grok: "Audit for security, perf, best practices, bugs. List issues prioritized + suggested code fixes."
+- Output: Markdown report (sections: Critical/High/Med/Low), optional `--fix` generates edit previews.
+- Reuse `edit` preview/apply workflow; add `--apply` flag.
+
+**CLI example**:
+```
+grokkit audit main.go                    # Single file report
+grokkit audit ./cmd --lang=go             # Dir, lang filter
+grokkit audit . --fix                     # Report + fix previews
+grokkit audit . --fix --yes               # Auto-apply fixes (dangerous, preview first)
+```
+
+**Similar to**: lint/review but deeper, proactive fixes.
+**Effort**: Medium (prompt tuning, multi-file handling ~300 LOC).
+**ROI**: High - daily dev essential, esp. before releases.