fix(plugin): real per-agent slot handle for multi-agent calendar tools

In multi-agent sync mode every harborforge_calendar_* tool was returning
`calendarScheduler.<method> is not a function`. The cause: index.ts replaced
`calendarScheduler` (typed `CalendarScheduler | null`) with a `{ stop() }`
stub right after wiring the runSync/runCheck intervals, so `isRunning()`,
`getCurrentSlot()`, `completeCurrentSlot()`, `abortCurrentSlot()`,
`pauseCurrentSlot()`, `resumeCurrentSlot()`, `getState()`,
`isRestartPending()` and `getStateFilePath()` all blew up at call time.

Replaces the stub with a `MultiAgentSchedulerHandle` that:
  - tracks the last slot dispatched per agent (recorded by `wakeAgent`)
  - exposes status/complete/abort/pause/resume taking the calling agentId
  - resolves the implicit "current slot" via woken-cursor first then a
    cache scan over not_started/deferred/ongoing slots
  - PATCHes via `bridge.updateSlotAs(agentId, …)` so audit headers reflect
    the real caller (bridge constructor agentId is 'unused' in multi-agent)
  - mirrors the legacy `isRunning/isProcessing/getState/...` surface so
    the single-agent fallback (`CalendarScheduler`) keeps working unchanged

Each calendar tool factory now takes `OpenClawPluginToolContext`, reads
`ctx.agentId`, and dispatches through the handle. Single-agent path
(when `calendarScheduler` is a real `CalendarScheduler`) is preserved
behind `instanceof` checks.

Drops the dead `trackSessionCompletion` poll loop (only definition, no
caller) which referenced the removed `completeCurrentSlot`. Bumps
plugin version 0.2.0 → 0.3.2.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

plugin/calendar/calendar-bridge.ts

@@ -110,6 +110,23 @@ export class CalendarBridgeClient {
     return this.sendBoolean('PATCH', url, update);
   }
 
+  /**
+   * Same as {@link updateSlot} but overrides the `X-Agent-ID` header for a
+   * single call. Used by the multi-agent scheduler handle where the bridge
+   * client is shared across agents and the constructor agentId is `'unused'`.
+   *
+   * Backend identifies the slot purely by `slotId`; the header is informational
+   * for audit. Passing the calling agent's id keeps audit/log lines correct.
+   */
+  async updateSlotAs(
+    agentId: string,
+    slotId: number,
+    update: SlotAgentUpdate
+  ): Promise<boolean> {
+    const url = `${this.baseUrl}/calendar/slots/${slotId}/agent-update`;
+    return this.sendBooleanAs(agentId, 'PATCH', url, update);
+  }
+
   /**
    * Update a virtual (plan-generated) slot's status after agent execution.
    *
@@ -264,6 +281,15 @@ export class CalendarBridgeClient {
   }
 
   private async sendBoolean(method: 'POST' | 'PATCH', url: string, body: unknown): Promise<boolean> {
+    return this.sendBooleanAs(this.config.agentId, method, url, body);
+  }
+
+  private async sendBooleanAs(
+    agentId: string,
+    method: 'POST' | 'PATCH',
+    url: string,
+    body: unknown
+  ): Promise<boolean> {
     const controller = new AbortController();
     const timeout = setTimeout(() => controller.abort(), this.timeoutMs);
 
@@ -272,7 +298,7 @@ export class CalendarBridgeClient {
         method,
         headers: {
           'Content-Type': 'application/json',
-          'X-Agent-ID': this.config.agentId,
+          'X-Agent-ID': agentId,
           'X-Claw-Identifier': this.config.clawIdentifier,
         },
         body: JSON.stringify(body),