chore: update KB index [skip ci]

.github/CHANGELOG.md

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+# Changelog — .github Directory
+
+All notable changes to workflows, automation, and .github folder structure.
+
+## [2025-01-27] Gitea Actions Workflows Setup
+
+### Added
+- **`.github/README.md`** - .github directory overview
+- **`.github/CHANGELOG.md`** - Workflow change tracking (this file)
+- **`.github/decisions.md`** - Automation decisions
+- **`.github/LLM-Usage-Guide--tendril.md`** - LLM instructions for workflows
+- **`.github/workflows/kb-lint.yml`** - KB file validation workflow
+- **`.github/workflows/kb-index-update.yml`** - KB index auto-update workflow
+
+### Notes
+- Phase 3 Gitea Actions Workflows Setup completed
+- All workflows use Gitea Actions (compatible with GitHub Actions format)
+- Workflows configured for Tendril repository structure
+- KB lint workflow validates all KB file naming and frontmatter rules
+- KB index update workflow automatically regenerates index on push to main
+
+---
+