feat(hub): 观测 counters 批2 — ws/delivery/offline/team-timeout/eventbus/admin（D 审计 G1/G2/G5/G6/G7/G10）

[DeliciousBuding]

D 审计批2 — 6 条 S 级观测缺口

纯加观测（counter/gauge + Inc/Set），不改业务控制流、不改返回值、不改签名。对齐 #1441/#1447 nil-guard 模式。metrics.go 唯一归属。

6 条 metric

G-ID	Metric	Type	Labels	落地点
G1	ws_delivery_failures_total	CounterVec	reason=marshal_error|conn_closed|conn_not_found	ws/manager.go PushToConn — 4 return 前各 Inc
G2	ws_disconnects_total / ws_reconnects_total / ws_stale_close_total	3× Counter	—	ws/manager.go Unregister / SetAuth(oldConnID) / pingAll stale close
G5	agent_dispatch_offline_push_failures_total	CounterVec	route=unbound_inviter_desktop|unbound_ws_miss|unbound_only|hub_relay|target_bound|redispatch	agent_dispatch.go 5 处 + agent_dispatch_target_bound.go 1 处
G6	team_assignment_timeouts_total + team_assignment_state_transition_failures_total	Counter + CounterVec	phase=status_update|event_append	agent_team_routing.go FailTimedOutAssignments
G7	eventbus_submit_failures_total	Counter	—	eventbus.go Publish pool.Submit 失败
G10	admin_server_up	Gauge	—	app/admin.go — Set 1 成功启动 / Set 0 凭据缺失或 ListenAndServe 失败

不碰

• fix(hub): fault-escalation review event 不再裸吞 + metric #1441 已加的 fault-escalation counter（同文件 agent_team_routing.go 不同行 :760，G6 在 :684-721）
• PROPOSAL docs(plan): WS 增量同步 Subscribe-with-Snapshot 提案 #1412-docs(plan): IM 反向桥接（飞书先行）提案 #1414 / super-governance-baseline
• 业务控制流、返回值、签名

改了哪些文件

1. hub-server/internal/metrics/metrics.go — 6 组 var + construct + MustRegister
2. hub-server/internal/ws/manager.go — G1 (4 Inc) + G2 (3 Inc)
3. hub-server/internal/service/agent_dispatch.go — G5 (5 routes) + import metrics
4. hub-server/internal/service/agent_dispatch_target_bound.go — G5 (1 route) + import metrics
5. hub-server/internal/service/agentteam/agent_team_routing.go — G6 (3 Inc)
6. hub-server/internal/service/eventbus.go — G7 (1 Inc)
7. hub-server/internal/app/admin.go — G10 (3 Set)

测试

go test ./internal/metrics/... ./internal/ws/... ./internal/service/... ./internal/middleware/... ./internal/app/... ./internal/handler/... -short -count=1

17 packages — all green。

gofmt -w ✓ | git diff --check ✓ | nil-guard 对齐 #1441/#1447 ✓

PROGRESS.md 未提交（untracked）。

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📥 Commits

Reviewing files that changed from the base of the PR and between 4d21187 and 6539541.

📒 Files selected for processing (7)

• hub-server/internal/app/admin.go
• hub-server/internal/metrics/metrics.go
• hub-server/internal/service/agent_dispatch.go
• hub-server/internal/service/agent_dispatch_target_bound.go
• hub-server/internal/service/agentteam/agent_team_routing.go
• hub-server/internal/service/eventbus.go
• hub-server/internal/ws/manager.go

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