v0.29.3

**Minimum supported Tailscale client version: v1.80.0**

### Changes

- Fix tagged node stuck expired after `tailscale logout`, unable to re-authenticate [#3394](https://github.com/juanfont/headscale/pull/3394)
- Re-registering a tagged node with a different pre-auth key now applies the new key's tags instead of silently keeping the old ones [#3394](https://github.com/juanfont/headscale/pull/3394)
- Fix re-authenticating an already-tagged node with `--advertise-tags` being rejected when the authenticating user owns the tags [#3394](https://github.com/juanfont/headscale/pull/3394)
- Fix ephemeral nodes lingering as disconnected after reconnect churn [#3383](https://github.com/juanfont/headscale/pull/3383)
- Fix node registration falsely returning `401 registration timed out` when auth completes as the request context expires [#3392](https://github.com/juanfont/headscale/pull/3392)
- Check the machine key on the followup registration poll so a leaked auth ID cannot return the registering user's identity [#3393](https://github.com/juanfont/headscale/pull/3393)
- Reject `/key` requests below the supported capability version floor, matching `/ts2021` [#3391](https://github.com/juanfont/headscale/pull/3391)

## Upgrade

Please follow the steps outlined in the [upgrade guide](https://headscale.net/stable/setup/upgrade/) to update your existing Headscale installation.

## Changelog
* 235a57ec31388901a78d054b1adb9dff900658cc CHANGELOG: add 0.29.3
* 089d6c41092c1c9da6c22a1493407747b9da0e15 Explicitly select lunr as search provider
* fba84ca2328330780433ce0ed45fa90e92559eac auth: check machine key on the followup registration path
* 12928418b8330a9ed3024045eb3199a90d01e9d1 build: bump Go toolchain to 1.26.5
* 9609a0b87ddc9cb28ec85244148bfed3b42f041a hscontrol: gate /key on supported capability version
* bdc3e996de162fb15149085b448d931e96c05eb9 hscontrol: prefer completed auth over expired ctx in followup wait
* 5aff68b5b9921db5ccb88013bb1740077ab872fb mkdocs: bump version
* 4a1e77359d288f94dccfc63ea2d1e869bd8e1daf policy,state: authorize reauth tags against the authenticating user
* 5fb514e6e09648676c8bd850201b0f84a6123694 poll: do not cancel ephemeral GC until Connect succeeds
* 1fccdb18bda259e92b439a447191643d33e52277 state: apply a new pre-auth key's tags on re-registration
* d2028832007b6b4544b119967db9658c9be24c6a state: do not expire tagged nodes on logout