chore(master): release 0.18.0

[arcbox-labs]

🤖 I have created a release beep boop

0.18.0 (2026-08-01)

Features

• desktop,agent-adapter: API-key / relay login on the signed-out agent card (#350) (39298ae)
• git: add local branch workflows to new sessions (7a023ef)
• git: add local branch workflows to new sessions (#376) (200753c)

Bug Fixes

• desktop: offer the install when an update is already downloaded (#377) (870e1c5)
• devenv: strip nix toolchain env from the mobile script (d0c4894)
• providers: authenticate subscription accounts (8f6a3ab)
• settings: open provider service catalog directly (6a43d51)
• ui: prevent branch search text overlap (91ccfb5)
• workbench: preserve subscription login state (9f88a5c)
• workbench: route signed-out setup through providers (f1839d1)
• workbench: support completable agent logins (3cbd825)

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[arcbox-labs]

🤖 Created releases:

• v0.18.0

🌻