v0.4.8

[0.4.8] - 2026-05-19

Improved — transport-agnostic error hints + AST guard test

Error messages no longer name MCP-tool-specific functions
(describe_location(...), list_curated()). The same ValueError
should read cleanly whether the caller is an MCP client, a REST
gateway (ausdata-api), or a Python script calling the functions
directly — naming an MCP tool by-name leaks transport details that
half the callers can't act on.

Three error-message sites rewritten:

• resolution._try_lat_lng — coord-out-of-AU hint
• resolution._try_postcode — non-mainland-postcode hint
• resolution.resolve_location — non-string input hint
• server.latest — current-weather fetch failure
• server.get_weather — historical-range fetch failure
• server.air_quality — air-quality fetch failure

Added — test_no_mcp_tool_refs_in_error_strings

AST-based guard test (mirrors abs-mcp / rba-mcp's validation
pattern). Walks every .py under src/au_weather_mcp/, parses
each raise <SomeExc>(...) call, and asserts the string argument
doesn't match describe_location|search_locations|list_curated
followed by an open paren. Locks in the no-tool-name-leakage rule
going forward — any future regression fails CI before merge.

111 unit tests pass (+1 guard test).