feat(gitea-skill): Rewrite Gitea agent skill with verified API patterns

Rewrites SKILL.md with patterns verified against live Gitea 1.22.6:
- Milestones as project containers (project board API does not exist)
- Scoped workflow labels with mutual exclusivity
- Issue dependencies using IssueMeta format
- 1Password token retrieval via op read
- Default repo terraphim/agent-tasks with env var overrides

Adds setup-labels.sh for idempotent repo and label creation.
Includes research and design documents from disciplined development.
Adds pre-commit config adapted for infrastructure project.

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

.pre-commit-config.yaml

@@ -0,0 +1,45 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+# Adapted from terraphim-ai pre-commit config for infrastructure project
+
+default_language_version:
+  python: python3.12
+
+repos:
+  # General code quality hooks
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: trailing-whitespace
+        name: Trim trailing whitespace
+      - id: end-of-file-fixer
+        name: Fix end of files
+      - id: check-yaml
+        name: Check YAML syntax
+      - id: check-json
+        name: Check JSON syntax
+      - id: check-case-conflict
+        name: Check for case conflicts
+      - id: check-merge-conflict
+        name: Check for merge conflicts
+      - id: detect-private-key
+        name: Detect private keys
+      - id: check-added-large-files
+        name: Check for large files
+        args: ['--maxkb=1000']
+
+  # Secret detection
+  - repo: https://github.com/Yelp/detect-secrets
+    rev: v1.5.0
+    hooks:
+      - id: detect-secrets
+        name: Detect secrets
+        args: ['--baseline', '.secrets.baseline']
+        exclude: .*\.template$|.*\.sample$
+        description: "Detect secrets in staged code"
+
+# Global exclusions
+exclude: |
+  (?x)(
+    ^\.cachebro/.*
+  )