feat: auto-update pouch and catalog sources during normal use

Add taste-skill to catalog.yaml, and refresh pouch plus cloned catalog
or custom Git sources on a 24h interval so users do not need a
separate update command.

pouch/paths.py

@@ -45,11 +45,18 @@ CONFIG_FILE = _first_existing_file(
     HOME / ".config" / "skiff" / "config.yaml",
     default=HOME / ".config" / "pouch" / "config.yaml",
 )
+DATA_DIR = _first_existing_dir(
+    HOME / ".local" / "share" / "pouch",
+    HOME / ".local" / "share" / "skiff",
+    default=HOME / ".local" / "share" / "pouch",
+)
 SOURCES_DIR = _first_existing_dir(
+    DATA_DIR / "sources",
     HOME / ".local" / "share" / "pouch" / "sources",
     HOME / ".local" / "share" / "skiff" / "sources",
     default=HOME / ".local" / "share" / "pouch" / "sources",
 )
+STATE_FILE = DATA_DIR / "state.yaml"
 
 AGENT_GLOBAL: dict[str, Path] = {
     "cursor": HOME / ".cursor" / "skills",