test: add 33 edge case tests for session-manager, session-aliases, and hooks
- session-manager: CRLF handling, empty sections, multi-heading title, context
extraction, notes/context detection, MB file size, uppercase ID rejection
- session-aliases: missing timestamps sort, title search, createdAt preservation,
whitespace-only path rejection, empty string title behavior
- hooks: session-start isolated HOME, template vs real session injection,
learned skills count, check-console-log passthrough
Total test count: 261 → 294
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