v0.1.8

QM 0.1.8 is a polish release for models, crons, and the web approval flow.

• Pick GPT-6 Astra from the model registry and picker.
• Slack cron deliveries now carry the cron's title and a link to its settings.
• Approval fixes in the web UI: repeated submissions stay isolated, and the input lock releases at run handoff.
• Layout and flow polish: a wide pane's composer stays on the transcript column, and revealed conversations open at the end.

What's Changed

• feat(models): add GPT-6 Astra by @16francej in #932
• core: pass a turn's surface name to the harness on every turn by @16francej in #930
• fix(web-ui): keep a wide pane's composer on the transcript column by @16francej in #946
• fix(web-ui): unlock composer after approval handoff by @16francej in #948
• Add cron settings footers to Slack deliveries by @ReganBell in #950
• fix: open revealed conversations at the end by @16francej in #929

Full Changelog: v0.1.7...v0.1.8