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feat(cli): rat grep for transcript search - #6
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New `rat grep <pattern>` subcommand that scans PtyOutput events across
session logs for a substring. Uniquely enabled by the event-log
design: works against live sessions, dead sessions with metas still
on disk, or any raw .log file — no daemon round-trip needed.
Flags:
- `-s, --session <id|name>` — limit to one session
- `--log <path>` — scan a specific log file
- `--raw` — match raw bytes; default strips ANSI so colored prompts
and editor decorations don't interfere with the match text.
Output format: `{session_short}:{seq}: {line}`, which composes cleanly
with unix piping. Plain substring match only for MVP; regex is a
natural follow-up.
Adds a tiny CSI-only ANSI stripper inline rather than pulling in
`vte` — grep only needs to drop color codes from match lines, full
terminal emulation would be overkill.
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Summary
`rat grep ` scans PtyOutput events across session logs. Works against live sessions, dead sessions with metas on disk, or any raw .log file — no daemon round-trip.
```sh
rat grep ERROR # all sessions
rat grep ERROR -s agent # single session
rat grep ERROR --log path.log # specific file
rat grep "\x1b\[31m" --raw # raw-byte match
```
Output: `{session_short}:{seq}: {line}`. Default strips ANSI; `--raw` matches literal bytes.
Test plan