Release v0.67.0

[BenevolentFutures]

Release v0.67.0. Draft until the staging smoke passes and the operator approves the release.

Summary

• Redesigned tab bar: scrolling strip, area-width tab sheet with agent/status/clocks, Rail layout, and a rare tip that teaches the rail (Tab bar QoL: solid collapsed header, draggable sheet, ghost-slot drop indicator #459, Tab sheet round three: fixed grid, count cell on every tier, description-only title bar #462, Tab bar round five: scrolling strip, area-width drawer, linked hover, rail layout #465, C11-243: record when the operator last looked at each tab #461, Live model detection for agent tabs (stacked on #462) #463, C11-245: offer a rare tip that teaches the tab rail #474).
• New vocabulary across UI and CLI: workspace → area → tab, with every old command, flag, ref and socket method kept as a hidden alias (C11-248: workspaces → areas → tabs vocabulary, with hidden aliases (phase 1: UI, CLI, socket, docs, tests) #472).
• Breaking for scripts: --tab on the sidebar status/progress/log commands now names a tab; bare-integer --tab fails as ambiguous (C11-248: workspaces → areas → tabs vocabulary, with hidden aliases (phase 1: UI, CLI, socket, docs, tests) #472).
• Close safety: windows and real workspaces ask before closing; destructive commands never fall back to the focused target; the last window keeps its session (Close safety: ask before closing windows and real workspaces; no silent fallbacks #469). Every quit asks first (Confirm every quit #456).
• Workspace root governs new terminals (C11-238: workspace root governs every new surface; visible and editable #453), New Workspace picker (C11-240: New Workspace picker: pins, search, path mode, recents CLI #457), session history (Session history; the resume picker never costs the previous session #467), long-path agent detection (Fix agent detection for long argv0 paths #471), Grok Build in the launch editor (Offer Grok Build when the launch editor picks Grok latest #468). Close Other Workspaces removed (Remove Close Other Workspaces #458).

Full entry: CHANGELOG.md.

Test plan

• CI green on this branch
• Staging build (nightly workflow on this branch) installed side by side and smoked against the changelog bullets
• C11-245 rail tip visual check (8 steps)
• Old vocabulary still works from the CLI: --surface, --pane, surface:N, pane:N, old command names
• Operator release approval, then tag v0.67.0

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