chore(main): release 1.4.0

[ludusrusso]

🤖 I have created a release beep boop

1.4.0 (2026-04-30)

Features

• tools: apply bounded-exec to node tool (#81) (960de63)
• tools: bounded-exec helper + bash timeout & output truncation (#79) (b97253b)
• tools: glob tool + pkg/search.Paths (#80) (ddb66c7)
• tools: grep tool + pkg/search foundation (#77) (48a479f)
• tools: multi_edit tool (atomic batched string-replace) (#78) (1250b2d)

Bug Fixes

• data race on ManagedSession.Messages between turn and external readers (#88) (021220f)
• tui: clear todo list upon /clean (cebf3c0)

Performance Improvements

• provider: use strings.Builder in streaming loop (96468cd)
• search: pre-allocate maps and slices in output builders (bf3c613)

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