URL normalization, release docs

[SmilingWayne]

• Penpa: parse_penpa_input handles full URLs, m=solve, and extra query params; invalid payloads raise PenpaDecodeError instead of leaking low-level binascii / zlib errors.
• puzz.link: parse_puzzlink_input accepts mirror hosts and bare paths; decode adds puzzlink_puzzle_path metadata.
  debug: format detection updated for these URL shapes.
• docs: pyproject.toml description/keywords; README section on URL interchange, example, collapsible type table;
• tests: round-trip / alternate-host coverage where applicable.

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