feat(agentctl): guild slash headless helpers (Phase 538)

Expose registerGuildSlashCommands, deleteGuildSlashCommand, and
executeGuildSlashCommand for slash automation and document phase538 bundle.

Co-authored-by: Cursor <[email protected]>

README.md

@@ -17,6 +17,8 @@ Both modes use **`pearcord-ui-flow` `dispatchUiMessage`** — the same handler a
 
 `AgentClient` resolves RPC replies before treating `{ event: "state" | "sidecar" }` push lines as events (fixes `wait-event` responses that include an `event` field).
 
+**v0.8.501 (Phase 538):** Headless `registerGuildSlashCommands`/`deleteGuildSlashCommand`/`executeGuildSlashCommand` for slash automation. Bundle: `npm run test:agentctl-phase538-slash` (chains `test:agentctl-phase489-slash`).
+
 **v0.8.500 (Phase 537):** Headless `createGuildChannelWebhook`/`deleteGuildChannelWebhook`/`executeGuildChannelWebhook` for webhook automation. Bundle: `npm run test:agentctl-phase537-webhooks` (chains `test:agentctl-phase488-webhooks`).
 
 **v0.8.499 (Phase 536):** Headless `exportGuildAuditLog(opts)` wraps `platform.exportAuditLog` for compliance automation. Bundle: `npm run test:agentctl-phase536-compliance` (chains `test:agentctl-phase487-compliance`).

headless.js

@@ -655,6 +655,27 @@ class HeadlessSession {
     return msg
   }
 
+  async registerGuildSlashCommands (commands) {
+    if (!this.platform) throw new Error('headless not started')
+    const rows = await this.platform.registerSlashCommands(commands)
+    await this.refreshView()
+    return rows
+  }
+
+  async deleteGuildSlashCommand (name) {
+    if (!this.platform) throw new Error('headless not started')
+    const removed = await this.platform.deleteSlashCommand(name)
+    await this.refreshView()
+    return removed
+  }
+
+  async executeGuildSlashCommand (content, opts = {}) {
+    if (!this.platform) throw new Error('headless not started')
+    const msg = await this.platform.executeSlashCommand(content, opts)
+    await this.refreshView()
+    return msg
+  }
+
   async banGuildMember (userId, reason) {
     if (!this.platform) throw new Error('headless not started')
     const ban = await this.platform.banMember({ userId, reason })