fix(ci): skip context sync drift check in CI environment

Context-sync walks up the directory tree to find the root AGENT.md.
On koala's act_runner, checkout is under /var/lib/act_runner/, not
under ~/dev/, so ROOT_CONTEXT resolves to empty. Generated files
differ from committed files (which include root context), causing
the drift check to fail.

Skip context sync when CI=true; local checks still verify sync.

Taskfile.yml

@@ -22,8 +22,11 @@ tasks:
   check:
     desc: Run all checks (context freshness + lint + test + vet)
     cmds:
-      - task: context:sync
       - cmd: |
+          if [ -n "${CI:-}" ]; then
+            echo "✓ context sync: skipped in CI"
+          else
+            bash scripts/context-sync.sh
             drift=$(git status --porcelain -- AGENTS.md CLAUDE.md .cursorrules .aider.conventions.md .context/system-prompt.txt 2>/dev/null)
             if [ -n "$drift" ]; then
               echo "ERROR: derived adapters drifted from canonical context." >&2
@@ -34,6 +37,7 @@ tasks:
               exit 1
             fi
             echo "✓ context: canonical and adapters are in sync"
+          fi
       - task: lint
       - task: test
       - task: vet