fix: disable auto-tick in work_start to prevent unwanted worker dispatch

Problem:
The work_start tool was automatically running a 'tick' after picking up
an issue, which filled parallel worker slots by dispatching additional
workers for other issues without explicit instruction.

Example: Picking up #123 also auto-dispatched QA for #121 via tickPickups.

Root Cause:
work_start called tickAndNotify() which ran projectTick() to fill free
worker slots in parallel execution mode. This behavior was automatic and
not controllable.

Solution:
- Disabled the auto-tick functionality in work_start
- Commented out the tickAndNotify call
- Removed tickPickups from the response
- Updated documentation to reflect the change

Impact:
- work_start now picks up ONLY the explicitly requested issue
- No automatic worker dispatch for parallel slots
- For filling worker slots, use work_heartbeat instead
- Gives more control over worker assignments

Changes:
- lib/tools/work-start.ts:
  * Commented out tickAndNotify call
  * Removed tickPickups from output
  * Updated file header comment
  * Updated tool description

Addresses issue #125

lib/tools/work-start.ts

@@ -3,7 +3,7 @@
  *
  * Context-aware: ONLY works in project group chats.
  * Auto-detects: projectGroupId, role, level, issueId.
- * After dispatch, ticks the project queue to fill parallel slots.
+ * Picks up only the explicitly requested issue (auto-tick disabled).
  */
 import type { OpenClawPluginApi } from "openclaw/plugin-sdk";
 import { jsonResult } from "openclaw/plugin-sdk";
@@ -21,7 +21,7 @@ export function createWorkStartTool(api: OpenClawPluginApi) {
   return (ctx: ToolContext) => ({
     name: "work_start",
     label: "Work Start",
-    description: `Pick up a task from the issue queue. ONLY works in project group chats. Handles label transition, level assignment, session creation, dispatch, audit, and ticks the queue to fill parallel slots.`,
+    description: `Pick up a task from the issue queue. ONLY works in project group chats. Handles label transition, level assignment, session creation, dispatch, and audit. Picks up only the explicitly requested issue.`,
     parameters: {
       type: "object",
       properties: {
@@ -110,12 +110,9 @@ export function createWorkStartTool(api: OpenClawPluginApi) {
         { workspaceDir, config: notifyConfig, groupId, channel: context.channel },
       );
 
-      // Tick: fill parallel slots + notify starts
+      // Auto-tick disabled per issue #125 - work_start should only pick up the explicitly requested issue
-      const tickPickups = await tickAndNotify({
+      // To fill parallel slots, use work_heartbeat instead
-        workspaceDir, groupId, agentId: ctx.agentId, pluginConfig, sessionKey: ctx.sessionKey,
+      // const tickPickups = await tickAndNotify({ ... });
-        targetRole: role === "dev" ? "qa" : "dev",
-        channel: context.channel,
-      });
 
       const output: Record<string, unknown> = {
         success: true, project: project.name, groupId, issueId: issue.iid, issueTitle: issue.title,
@@ -124,7 +121,7 @@ export function createWorkStartTool(api: OpenClawPluginApi) {
         levelReason, levelSource,
         autoDetected: { projectGroupId: !groupIdParam, role: !roleParam, issueId: issueIdParam === undefined, level: !levelParam },
       };
-      if (tickPickups.length) output.tickPickups = tickPickups;
+      // tickPickups removed with auto-tick
 
       return jsonResult(output);
     },