v0.2.2

Fixes

• Summarizer no longer records hook-error output. summarize_one() accepted whatever headless claude -p printed on a 0 exit code; a misbehaving hook in the user's environment (e.g. claude-mem's UserPromptSubmit failing) could emit a block notice to stdout that got saved verbatim as a file's summary. Added _is_valid_summary() to reject hook/permission notices before recording (+test).
• Synced __version__ in __init__.py (was stuck at 0.1.0).

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