v0.81.0

# Some UX stuff for ya

We're starting the week in good style by adding some nice additions and improvements.

## Chat scrollbar

This is it, the chat just got a scrollbar! This should make your life easier on navigation long session. You can now see exactly where you are when scrolling.

It's possible to adjust the behavior with a setting: `options.tui.scrollbar`.

* `default` (hides after 2 seconds)
* `always`
* `never`

```jsonc
{
  "options": {
    "tui": {
      "scrollbar": "default" // default, always, never
    }
  }
}
```

https://github.com/user-attachments/assets/c0c0f888-78d4-4457-ae32-eb1a2dd5f575

## Herdr Support

Have you been wanting to use [herdr.dev](https://herdr.dev/) for all your agent management needs? Well now its even better! @taciturnaxolotl merged support for agent status signaling so now herdr can pick up on the status of crush and send you notifications when it is blocked or finished!

<img width="1470" height="956" alt="image" src="https://github.com/user-attachments/assets/4ab696c7-d105-4c91-b658-8902e930dc5f" />

## Lower CPU usage

Crush could use too much CPU when streaming thinking traces and showing them for you. @taciturnaxolotl worked through an optimization and that's now fixed!

## Fix possible deadlock on startup

If you happen to have a model ID in your config that does not exist anymore (was removed from the providers), Crush could lock when booting and not start at all. This bug was addressed.

## Images and your session

This is another fix to prevent your session from breaking when you switch to a non-vision model but your session already has images. We're going to skip the images so your session keep working.

That's all!
Charm

## Changelog
### New!
* b39a85ec2b2be2ca8c759383cdc39ce325dda1dd: feat(herdr): add herdr socket integration (@taciturnaxolotl)
* b72f9aab844ab42de7bcf778e3fcf743a010d0bd: feat(ui): add scrollbar to chat view (#3018) (@andreynering)
* db8add714e294401ce2e716459376f3803fac3ce: feat(ui): allow expanding toolcall names (@taciturnaxolotl)
### Fixed
* f75435a2ac2e69cf4d64ad15bf5d84f284cdecd6: fix(agent): fall back to first reasoning level when default is unset (#3218) (@syf2211)
* d3d68045ff907c8a7103f78c99c5b517476aa65a: fix(agent): prevent session bricking when non-vision models receive tool result media (@taciturnaxolotl)
* a08e3329c0b540cc851f5d2e0e9405cd06fa7c2c: fix(bash): keep TruncateOutput from splitting UTF-8 characters (@feizhuzheng)
* 1535ebb7cd206029591dfe9ae5b269193d4cad2f: fix(config): prevent stale ReasoningEffort from leaking across providers (#3209) (@huaiyuWangh)
* d4dc84e91471a6c794a037ff5012e42fd070e960: fix(config): prevent startup deadlock when configured model ID is invalid (@taciturnaxolotl)
* 188dea64e2e84468c4d2059e4e8ce2f580c2efdb: fix(fsext): DirTrim renders wrong character for non-ASCII directory names (#3214) (@feizhuzheng)
* a07d304f9174d57059a5264b2c34dfd431fa00ff: fix(hyper): refresh hyper oauth token before fetching credits (#3212) (@andreynering)
* a1b19ebc33e4085af0322d665cb3bb7fbd66c713: fix(prompts): unindent heredoc (@taciturnaxolotl)
* a9e3a57f7a9f40cd411e5ac1b98156b8240ed1fb: fix(shell): skip persistence when session no longer exists (@syf2211)
* 3a99992e863a5fe82266f9eec6433affac956b12: fix(ui): ansi.truncate instead of byte slicing in todos (@taciturnaxolotl)
* 9c61c7d032504a21760478c4c72f81cce7a11efc: fix(ui): use ansi.truncate everywhere (@taciturnaxolotl)
* 3295a085cfb405c450ae3ac1fd89ab8989793e99: fix: cache streaming thinking renders to avoid CPU burn during long reasoning traces (@taciturnaxolotl)
### Other stuff
* 5c934c30954f6241fb1acb582ef4376bb958702a: chore: auto-update files (@charmcli)
* f645040c1ba002fa8c65e0addd5e5be4eae35337: chore: auto-update files (@charmcli)
* fcccdfee42a77eb67b54d670ca3463121522dc4a: chore: auto-update files (@charmcli)
* 358d75dbdbc4bd329cde36e71065805cf5762ed1: chore: regen golden files (@taciturnaxolotl)

---

<details>
<summary>Verifying the artifacts</summary>

First, download the [`checksums.txt` file](https://github.com/charmbracelet/crush/releases/download/v0.81.0/checksums.txt) and the [`checksums.txt.sigstore.json` file](https://github.com/charmbracelet/crush/releases/download/v0.81.0/checksums.txt.sigstore.json) files, for example, with `wget`:

```bash
wget 'https://github.com/charmbracelet/crush/releases/download/v0.81.0/checksums.txt'
wget 'https://github.com/charmbracelet/crush/releases/download/v0.81.0/checksums.txt.sigstore.json'
```

Then, verify it using [`cosign`](https://github.com/sigstore/cosign):

```bash
cosign verify-blob \
  --certificate-identity 'https://github.com/charmbracelet/meta/.github/workflows/goreleaser.yml@refs/heads/main' \
  --certificate-oidc-issuer 'https://token.actions.githubusercontent.com' \
  --bundle 'checksums.txt.sigstore.json' \
  ./checksums.txt
```

If the output is `Verified OK`, you can safely use it to verify the checksums of other artifacts you downloaded from the release using `sha256sum`:

```bash
sha256sum --ignore-missing -c checksums.txt
```

Done! You artifacts are now verified!

</details>

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