fix: convert antfarm from broken submodule to regular directory

Fixes Gitea 500 error caused by invalid submodule reference.
Converted antfarm from pseudo-submodule (missing .gitmodules) to
regular directory with all source files.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

antfarm/CHANGELOG.md

@@ -0,0 +1,21 @@
+# Changelog
+
+## v0.2.0 — 2026-02-09
+
+### Fixed
+- Step output now reads from stdin instead of CLI arguments, fixing shell escaping issues that caused complex output (STORIES_JSON, multi-line text) to be silently dropped
+- This was the root cause of loop steps (like security audit fixes) completing with zero work done
+
+### Added
+- `antfarm version` — show installed version
+- `antfarm update` — pull latest, rebuild, and reinstall workflows in one command
+- CHANGELOG.md
+
+## v0.1.0 — Initial release
+
+- Multi-agent workflow orchestration for OpenClaw
+- Three bundled workflows: feature-dev, bug-fix, security-audit
+- Story-based execution with per-story verification
+- SQLite-backed run/step/story tracking
+- Dashboard at localhost:3333
+- CLI with workflow management, step operations, and log viewing