Replace SDK-based dashboard builder with native /create-dashboard command

The SDK wrapped the Anthropic Agent SDK to orchestrate dashboard building,
but this made Claude run headless — unable to ask users questions mid-process
or show progress. Replace with a command .md file following the same proven
pattern as /encode-reform and /backdate-program: Task tool subagents, disk
file handoffs, AskUserQuestion for human gates, and parallel agent spawning.

All 10 dashboard agents are unchanged — they already work as Task tool
subagents. Telemetry (Supabase) and per-phase budget caps are dropped.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: anth-volk

.claude-plugin/marketplace.json

@@ -249,6 +249,7 @@
         "./agents/dashboard/dashboard-overview-updater.md"
       ],
       "commands": [
+        "./commands/create-dashboard.md",
         "./commands/deploy-dashboard.md",
         "./commands/dashboard-overview.md"
       ],
@@ -366,6 +367,7 @@
         "./commands/fix-pr.md",
         "./commands/new-tool.md",
         "./commands/setup-verbs.md",
+        "./commands/create-dashboard.md",
         "./commands/deploy-dashboard.md",
         "./commands/dashboard-overview.md"
       ],

changelog.d/migrate-dashboard-to-command.changed.md

@@ -0,0 +1 @@
+Replace SDK-based dashboard builder with native /create-dashboard command for full user interactivity