Refactor agent spawning and delegation check mechanisms

- Updated agent spawning from `Task()` to `Agent()` across various files to align with new standards.
- Enhanced the `code-developer` agent description to clarify its invocation context and responsibilities.
- Introduced a new `delegation-check` skill to validate command delegation prompts against agent role definitions, ensuring content separation and conflict detection.
- Established comprehensive separation rules for command delegation prompts and agent definitions, detailing ownership and conflict patterns.
- Improved documentation for command and agent design specifications to reflect the updated spawning patterns and validation processes.

codex-lens-v2/src/codexlens_search/search/fts.py

@@ -67,3 +67,28 @@ class FTSEngine:
             "SELECT content FROM docs WHERE rowid = ?", (doc_id,)
         ).fetchone()
         return row[0] if row else ""
+
+    def get_chunk_ids_by_path(self, path: str) -> list[int]:
+        """Return all doc IDs associated with a given file path."""
+        rows = self._conn.execute(
+            "SELECT id FROM docs_meta WHERE path = ?", (path,)
+        ).fetchall()
+        return [r[0] for r in rows]
+
+    def delete_by_path(self, path: str) -> int:
+        """Delete all docs and docs_meta rows for a given file path.
+
+        Returns the number of deleted documents.
+        """
+        ids = self.get_chunk_ids_by_path(path)
+        if not ids:
+            return 0
+        placeholders = ",".join("?" for _ in ids)
+        self._conn.execute(
+            f"DELETE FROM docs WHERE rowid IN ({placeholders})", ids
+        )
+        self._conn.execute(
+            f"DELETE FROM docs_meta WHERE id IN ({placeholders})", ids
+        )
+        self._conn.commit()
+        return len(ids)