feat: Drone pane — Phase 1 node-graph canvas for automated agents

[Agent1-asaf]

Summary

Adds the Drone pane — a new view type (`drone`) for defining and monitoring automated agents triggered by cron schedules, events, or other drones completing.

Phase 1 is the full frontend scaffold: interactive node-graph canvas with pan/zoom, draggable nodes, an edit panel, and a run log drawer. No backend scheduler yet (Phase 2).

What's included

New files — `frontend/app/view/drone/`

• `drone-types.ts` — DroneDefinition, DroneRun, DroneTrigger (cron/event/dependency/manual), CanvasTransform
• `drone-utils.ts` — cron → human-readable preview, status icons/colors, relative time helpers
• `drone-model.ts` — DroneViewModel with SolidJS signals for drones, run history, canvas transform, edit panel state
• `drone-node.tsx` — node component: status dot, trigger badges, last run time, expandable details, drag handle
• `drone-edit-panel.tsx` — right-side drawer for creating/editing drones (name, task, triggers, run policy)
• `drone-run-log.tsx` — bottom drawer showing run history per selected drone
• `drone-view.tsx` — canvas with pan/zoom, SVG dependency edges, empty state
• `drone-view.css` — full styles using existing CSS vars
• `drone.tsx` — barrel file wiring viewComponent onto model prototype (same pattern as forge/swarm)

Modified files

• `frontend/app/block/block.tsx` — registers "drone" in BlockRegistry
• `frontend/app/block/blockutil.tsx` — icon "robot", name "Drone" for fallback header
• `agentmuxsrv-rs/src/config/widgets.json` — adds defwidget@drone (order 4, visible, cyan #06b6d4)
• `docs/specs/drone-pane.md` — full spec (triggers, data model, backend architecture, phased plan)
• `docs/analysis/cef-vs-tauri-value-prop.md` — analysis of CEF vs Tauri value prop post-PR feat: CEF host — Phases 1-3 + frontend bridge + AgentA testing fixes #253

What works in Phase 1

• Open Drone pane from launcher widget bar
• Canvas with dot-grid background, pan by dragging, zoom with scroll wheel
• Draggable nodes with status color, trigger label, last-run time
• Expand nodes to see runtime, retry count, run sparkline
• Hover for Run now / Edit / Disable quick actions
• Edit panel: name, task prompt, cron/event/dependency/manual triggers, run policy
• Cron trigger live human-readable preview (e.g. "Weekdays at 7:00 AM")
• Run log drawer: run history with state, trigger, duration
• SVG dependency edges (bezier, color-coded by success/failure/any)
• TypeScript clean (zero new errors)

What's next (Phase 2)

• DroneScheduler in agentmuxsrv-rs — cron loop + event bus subscription
• Persistence: WOS for definitions, SQLite for run records
• Real triggerDrone IPC instead of mock setTimeout

🤖 Generated with Claude Code

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

[reagentx-workflow]

ReAgent Diagnostics

Field	Value
ReAgent Version	5.12.5
Trigger	PR opened
Project Context	CLAUDE.md loaded
Model	claude-opus-4-6
Effort	high
Ref Repos	Disabled
Merge Analysis	Clean
Review Time	108.7s
Timestamp	2026-03-30T20:39:41Z
Repository	agentmuxai/agentmux
PR	#256

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Confirmed: updateTrigger at line 46 shallow-merges patch onto the existing trigger, so changing type from "cron" to "manual" would leave stale expr on the object.

Issues:

• drone-model.ts:14 - viewIcon returns "drone" which is not a valid FontAwesome icon; should be "robot" to match widgets.json and blockutil.tsx (every other view model matches its widget icon)
• drone-edit-panel.tsx:46 - Changing trigger type via dropdown shallow-merges onto the old trigger object, leaving stale type-specific fields (e.g. expr persists after switching from cron to manual); should reset to a clean trigger of the new type
• package.json:9 - New feature (new view type + widget visible in launcher) version-bumped as patch (0.33.1 → 0.33.2); per semver policy new features should be a minor bump (0.34.0)

[reagentx-workflow]

ReAgent Diagnostics

Field	Value
ReAgent Version	5.12.5
Trigger	Re-review (new commits)
Project Context	CLAUDE.md loaded
Model	claude-opus-4-6
Effort	high
Ref Repos	Disabled
Merge Analysis	Clean
Review Time	154.6s
Timestamp	2026-03-30T20:45:54Z
Repository	agentmuxai/agentmux
PR	#256

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Issues:

• docs/analysis/cef-vs-tauri-value-prop.md:1 - Unrelated to drone pane feature; 308-line CEF-vs-Tauri strategic analysis belongs in a separate PR or with PR #253 (CEF integration)
• frontend/app/view/drone/drone-view.css:752 - @keyframes drone-pulse animation defined but never referenced in any drone component (dead code)

[reagentx-workflow]

ReAgent Diagnostics

Field	Value
ReAgent Version	5.12.5
Trigger	Re-review (new commits)
Project Context	CLAUDE.md loaded
Model	claude-opus-4-6
Effort	high
Ref Repos	Disabled
Merge Analysis	Clean
Review Time	104.2s
Timestamp	2026-03-30T20:51:12Z
Repository	agentmuxai/agentmux
PR	#256

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LGTM