Document what-happened skill

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Sessions

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- works with functions, files, and individual line changes
- reports clearly when code is untracked, uncommitted, or created outside an Entire session

### `what-happened`

Explains what happened to a specific code block by tracing the latest change for a file range or pasted snippet through git blame and Entire checkpoints.

Current behavior:

- resolves file ranges or pasted snippets to exact line numbers
- groups matching blame ranges by unique commit before reading checkpoint context
- uses cheap-first `entire explain` lookups before expanding checkpoint transcripts
- falls back to clearly labeled current-code analysis when checkpoint-backed context is unavailable

Examples:

- "what happened here: `src/auth.ts:42-57`"
- "what happened to this block?" plus a pasted snippet

### `search`

Searches Entire checkpoint history and transcripts to find prior work by topic, repo, branch, author, or time window.