v0.3.0

What's changed

• Auth: configurable timeout parameter propagated to all Cognito HTTP calls; invalidate_access_token() public method replaces internal token-store mutation on 401 retry
• Transport: 401 retry path uses invalidate_access_token() instead of accessing private auth internals
• Client: URL-encoding applied to all user-supplied path segments; _check_closed() guard on every public method and on transport/auth properties and __aenter__; _ensure_list raises RatioApiError for unexpected non-list/non-dict/non-null payloads; close() clears internal references
• Token store: JsonFileTokenStore._write uses tempfile.mkstemp() with unique .ratio_tokens_ prefix, with explicit fd cleanup on failure and temp-file removal if chmod/replace fails
• Models: _required() helper raising RatioApiError on missing required fields in Charger, ChargerOverview, Session, CommandRequest; _parse_bool() in settings correctly handles string "false"/"true" and respects default for unrecognised values
• Package: __version__ and USER_AGENT derived from importlib.metadata at runtime
• CI: mypy step added; branch trigger updated to main