feat(tui): universal command palette action system (#194)

[windoliver]

Summary

Closes #194. Turns the TUI command palette into a universal, searchable, context-sensitive action system unified on a single action model.

• One Action model ({id,label,detail,group,keywords?,available?,enabled?,run}) replaces the old discriminated-union PaletteItem + the separate plugin switch. Built-in actions are built from live state; plugins are wrapped by an adapter into the same model.
• Two-tier context: rich internal ActionContext for built-ins; the narrow TuiPluginContext is preserved for plugins (blast radius unchanged).
• Relevance gating: available(ctx) hides irrelevant actions; enabled(ctx) greys unexecutable ones.
• Grouped sections — Navigation / Agents / Workflow / View / Contributions / Plugins — collapse to a flat fuzzy-ranked list (label + keyword) when searching. Selection is a flat index over the displayed list.

Actions reachable from the palette

• Navigation: focus any panel — core (DAG/Detail/Frontier/Claims) and operator (Terminal/VFS/…); jump to session; open contribution. Focused-panel-sensitive: frontier next/prev slice, scroll terminal to bottom.
• Agents: spawn (per profile/role, capacity in detail + greyed at cap), kill, delegate, broadcast message, direct message.
• Workflow: set goal, approve/deny pending question, compare, register profile.
• View: refresh, search transcripts, cycle zoom, reset zoom, toggle layout (grid/tab), cycle view mode (grid/pipeline), quit.
• Contributions (only when a cid is selected): open, add-to-compare, adopt.
• Plugins: adapted registrations.

Verification

• Unit + render tests: 28 pass / 0 fail (builders gating, plugin-adapter narrowing, visibility ordering/keyword ranking, reserved-ids, grouped/flat render, greyed-disabled, context-sensitivity, focused-panel gating, View group).
• tsc --noEmit → 0 errors; biome clean; pre-push typecheck+build pass.
• Adversarial 4-lens review (coverage/correctness/regression/runtime): 0 critical; the 3 important findings (view-mode toggle, core-panel reach, search-panel reveal) were all fixed in this branch.
• Live grove TUI smoke (real grove tui → inspect overlay → Space c p): palette opens and renders all grouped sections live; fuzzy filter collapses to a flat ranked result; executing Broadcast enters Message @all mode (keyboard→run + close-before-run verified); executing Search transcripts reveals the [10:Search] panel with a visible input (third fix verified live).

🤖 Generated with Claude Code

[windoliver]

Hardening round (commit 44d9ed1)

Ran a second adversarial review over the gap-closure; it surfaced issues that I've now fixed:

• Circular import removed — fuzzyMatch extracted to src/tui/actions/fuzzy.ts; visibility.ts and command-palette.tsx both import it (no cycle).
• Duplicate spawn id — the profile loop now de-dupes by role (two profiles sharing a role → one agent.spawn.<role>); catalog ids are all-unique.
• Reveal-not-hide — jumpToSession (Terminal) and enterSearch (Search) now focus an already-visible panel instead of toggling it off.
• Coverage — added Cycle to next/previous panel (Navigation) and Show help (View) palette actions.

Verification:

• 30 unit/render tests pass; tsc --noEmit 0 errors; biome clean; pre-push build passes.
• Final 2-lens adversarial review: 0 critical / 0 important / 0 real defects (consistency lens confirmed every ActionContext capability is wired, 51 actions all-unique, no genuinely-missing discrete action beyond the agreed exclusions).
• Live grove TUI recheck: the new Cycle to next/previous panel + Show help actions render in the palette, and executing Show help opened the Keybinding Reference overlay (new capability fires through the real keyboard→run path).