chore(context): stop policing cursor/aider adapters in task check

Drop the context:sync:cursor task and remove .cursorrules +
.aider.conventions.md from the drift-guard file list in `check`, now
that the generator no longer emits them.

Taskfile.yml

@@ -17,8 +17,6 @@ tasks:
     cmds: [bash scripts/context-sync.sh claude]
   context:sync:agents:
     cmds: [bash scripts/context-sync.sh agents]
-  context:sync:cursor:
-    cmds: [bash scripts/context-sync.sh cursor]
 
   # ── Development ────────────────────────────────────────────────────────────
 
@@ -90,12 +88,12 @@ tasks:
     cmds:
       - task: context:sync
       - cmd: |
-          drift=$(git status --porcelain -- AGENTS.md CLAUDE.md .cursorrules .aider.conventions.md .context/system-prompt.txt 2>/dev/null)
+          drift=$(git status --porcelain -- AGENTS.md CLAUDE.md .context/system-prompt.txt 2>/dev/null)
           if [ -n "$drift" ]; then
             echo "ERROR: derived adapters drifted from canonical context." >&2
             echo "$drift" >&2
             echo "" >&2
-            echo "Run: git add AGENTS.md CLAUDE.md .cursorrules .aider.conventions.md .context/system-prompt.txt" >&2
+            echo "Run: git add AGENTS.md CLAUDE.md .context/system-prompt.txt" >&2
             echo "     git commit -m 'chore: re-sync context adapters'" >&2
             exit 1
           fi