storkit: create 390_bug_whatsapp_missing_async_command_handlers_for_start_rebuild_reset_rmtree_assign

.storkit/work/1_backlog/390_bug_whatsapp_missing_async_command_handlers_for_start_rebuild_reset_rmtree_assign.md

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+---
+name: "WhatsApp missing async command handlers for start, rebuild, reset, rmtree, assign"
+---
+
+# Bug 390: WhatsApp missing async command handlers for start, rebuild, reset, rmtree, assign
+
+## Description
+
+Five bot commands listed in help don't work in WhatsApp. Matrix's on_room_message pre-dispatches these via extract_*_command() functions before calling try_handle_command(), but WhatsApp's handle_incoming_message only pre-dispatches htop and delete. The missing commands have fallback handlers that return None, so they silently fall through to the LLM instead of executing.
+
+## How to Reproduce
+
+1. Send "rebuild" (or "start 386", "reset", "rmtree 386", "assign 386 opus") to the WhatsApp bot\n2. Observe the message is forwarded to the LLM instead of executing the command
+
+## Actual Result
+
+The 5 commands (start, rebuild, reset, rmtree, assign) fall through to the LLM and generate a conversational response instead of executing the bot command.
+
+## Expected Result
+
+All commands listed in help should work in WhatsApp, matching Matrix behavior. start should spawn an agent, rebuild should rebuild the server, reset should clear the session, rmtree should remove a worktree, assign should pre-assign a model.
+
+## Acceptance Criteria
+
+- [ ] start command works in WhatsApp (extract_start_command dispatch)
+- [ ] rebuild command works in WhatsApp (extract_rebuild_command dispatch)
+- [ ] reset command works in WhatsApp (extract_reset_command dispatch)
+- [ ] rmtree command works in WhatsApp (extract_rmtree_command dispatch)
+- [ ] assign command works in WhatsApp (extract_assign_command dispatch)
+- [ ] Same 5 commands also work in Slack transport if similarly missing