feat(pm): epic seats open a mailbox and show on the fleet roster

.claude/skills/pm-dispatch/references/project-forms.md

@@ -33,7 +33,7 @@
 
 ## 信箱 PR
 
-- 每席一个 draft PR,键是席位 ⛔ 非账号:分支 `mailbox/<login>/<slug>`,标签 `pm:mailbox`+`pinned`。
+- 每席一个 draft PR,键是席位 ⛔ 非账号,epic 席 `epic:#<n>#<k>` 同样开;标签 `pm:mailbox`+`pinned`。
 - 正文首行 `Mailbox-of: <席位> · <login>`;坐席即开(`mailbox-open.mjs`)并订阅,存根记 `Mailbox:`。
 - 永不合并,不欠 CI,落地与台账查询排除它;移交或换账号关旧开新;评论首行 `To: <席位>`。
 - 次行恒为一键,下列事件必敲;一事一行 ≤200 字节,只写键与编号;表外即半态。

scripts/pm/fleet-roster.fixture.json

@@ -10,6 +10,13 @@
         { "number": 6015, "title": "[PM seat] triage (objectstack-wide) — 🟢 Routine · session_01AavokzJ5DndAwitDXvKy4U · trig_01NcnCtMS2tH46nUg1a5TaMJ (hourly)", "body": "", "labels": [{ "name": "pm:seat" }], "assignees": [], "updated_at": "2026-10-23T12:59:06Z" },
         { "number": 999, "title": "Fleet seat registry", "body": "", "labels": [{ "name": "pm:seat" }], "assignees": [], "updated_at": "2026-10-01T00:00:00Z" }
       ],
+      "epics": [
+        { "number": 27293, "title": "[Epic] Marketplace and connector auto-shelf", "body": "epic:#27293#1 · sunhaolin · session_017xRBcVBKAFk1ntXSjvPt7U\n\n## Epic PM registration", "labels": [{ "name": "pm:epic" }], "sub_issues_summary": { "total": 31 }, "updated_at": "2026-10-20T09:00:00Z" },
+        { "number": 26676, "title": "epic: record page v2", "body": "Reserved for the epic PM session `session_cdb7a717-def7`.", "labels": [{ "name": "pm:epic" }], "sub_issues_summary": { "total": 20 }, "updated_at": "2026-10-22T09:00:00Z" },
+        { "number": 28647, "title": "a child of #27293", "body": "epic:#27293#1 · sunhaolin · session_017xRBcVBKAFk1ntXSjvPt7U", "labels": [{ "name": "pm:epic" }], "sub_issues_summary": { "total": 0 }, "updated_at": "2026-10-23T09:00:00Z" },
+        { "number": 28800, "title": "[Epic] delegated, no sub-issue filed yet", "body": "epic:#28800#2 · os-tesla · session_01FreshEpicPm", "labels": [{ "name": "pm:epic" }], "sub_issues_summary": { "total": 0 }, "updated_at": "2026-10-23T10:00:00Z" },
+        { "number": 27108, "title": "[Epic] not yet delegated", "body": "Owner: undecided.", "labels": [{ "name": "pm:epic" }], "sub_issues_summary": { "total": 3 }, "updated_at": "2026-10-23T09:00:00Z" }
+      ],
       "dispatched": [
         { "number": 25416, "labels": [{ "name": "pm:dispatched" }, { "name": "domain:devx" }, { "name": "tooling" }], "assignees": [{ "login": "os-elon-musk" }], "updated_at": "2026-10-23T13:28:00Z" },
         { "number": 25300, "labels": [{ "name": "pm:dispatched" }, { "name": "domain:devx" }], "assignees": [{ "login": "os-sales" }], "updated_at": "2026-10-23T02:00:00Z" },
@@ -28,6 +35,10 @@
         { "number": 25394, "state": "open", "head": { "ref": "mailbox/os-sales/devx-2" }, "body": "", "labels": [{ "name": "pm:mailbox" }] },
         { "number": 25395, "state": "open", "head": { "ref": "claude/project-thread-eeee" }, "body": "To: os-sales\n\nThe mailbox of the seat held by `os-sales`", "labels": [{ "name": "pm:mailbox" }, { "name": "pinned" }] },
         { "number": 25396, "state": "open", "head": { "ref": "claude/project-thread-ffff" }, "body": "Mailbox-of: domain:spec#5 · os-tesla", "labels": [{ "name": "pm:mailbox" }] },
+        { "number": 25397, "state": "open", "head": { "ref": "mailbox/sunhaolin/epic-27293-1" }, "body": "Mailbox-of: epic:#27293#1 · sunhaolin", "labels": [{ "name": "pm:mailbox" }, { "name": "pinned" }] },
+        { "number": 25399, "state": "open", "head": { "ref": "mailbox/os-tesla/epic-28800-2" }, "body": "Mailbox-of: epic:#28800#2 · os-tesla", "labels": [{ "name": "pm:mailbox" }, { "name": "pinned" }] },
+        { "number": 25400, "state": "open", "head": { "ref": "mailbox/os-bill/epic-27293-2" }, "body": "", "labels": [{ "name": "pm:mailbox" }] },
+        { "number": 25398, "state": "open", "head": { "ref": "mailbox/os-zhuang/epic-28130-1" }, "body": "Mailbox-of: epic:#28130#1 · os-zhuang", "labels": [{ "name": "pm:mailbox" }, { "name": "pinned" }] },
         { "number": 25433, "state": "open", "head": { "ref": "claude/project-thread-cccc" }, "body": "Fixes #25417", "labels": [] }
       ],
       "comments": {
@@ -40,6 +51,7 @@
         { "number": 5560, "title": "[PM seat] domain:ui @ objectui — 🟢 os-sales · 由Sales账户的项目负责", "body": "## 1. Current PM\n\n- **Wall:** limit reached, resets at 15:00Z\n", "labels": [{ "name": "pm:seat" }], "assignees": [{ "login": "os-sales" }], "updated_at": "2026-10-22T18:06:56Z" },
         { "number": 10243, "title": "[PM seat] domain:ui · seat 4 — 🟢 os-sales · session_01SJn1GE · ui lane", "body": "", "labels": [{ "name": "pm:seat" }], "assignees": [{ "login": "os-sales" }], "updated_at": "2026-10-17T16:05:27Z" }
       ],
+      "epics": [],
       "dispatched": [
         { "number": 13330, "labels": [{ "name": "pm:dispatched" }, { "name": "domain:ui" }], "assignees": [{ "login": "os-sales" }], "updated_at": "2026-10-23T13:28:00Z" }
       ],
@@ -52,6 +64,7 @@
         { "number": 2180, "title": "[PM seat] repo:hotcrm · seat 2 — ⏳ vacant", "body": "", "labels": [{ "name": "pm:seat" }], "assignees": [], "updated_at": "2026-10-21T08:38:12Z" },
         { "number": 1353, "title": "[PM seat] repo:hotcrm — 🟢 os-elon-musk · 由 os-elon-musk 账户的项目负责", "body": "", "labels": [{ "name": "pm:seat" }], "assignees": [{ "login": "os-elon-musk" }], "updated_at": "2026-10-22T14:39:07Z" }
       ],
+      "epics": [],
       "dispatched": [
         { "number": 2253, "labels": [{ "name": "pm:dispatched" }], "assignees": [{ "login": "os-elon-musk" }], "updated_at": "2026-10-23T13:50:00Z" }
       ],