fix(streaming): pass agentId to resolveStorePath to fix non-default agent footer metrics

[smallmj]

Summary

Footer metrics (tokens/cache/context/model) were always missing for non-default agents because resolveStorePath() was called without passing the agentId, causing the SDK to default to 'main' and look up the wrong per-agent session store file.

Root Cause

The SDK's resolveStorePath(store, opts?: { agentId?: string }) was being called as:
resolveStorePath(sessionStorePath) — missing the agentId argument.

This means regardless of which agent handled the request, the metrics lookup always went to ~/.openclaw/agents/main/sessions/sessions.json instead of the correct agent's session file.

Fix

Extract agentId from sessionKey (format: 'agent:<agentId>:feishu:...') and pass it to both resolveStorePath() calls (runtime.agent.session path and channel.session path).

Change Type

• Bug fix
• Feature
• Refactor required for the fix
• Docs
• Security hardening
• Chore/infra

Scope

• Gateway / orchestration (streaming card controller)
• Skills / tool execution
• Auth / tokens
• Memory / storage
• Integrations
• API / contracts
• UI / DX
• CI/CD / infra

Compatibility

• Backward compatible: Yes — if agentId is undefined (malformed sessionKey), it falls back to the default behavior, exactly as before.
• Config changes: None
• Migration needed: None

Linked Issue

• Fixes Footer metrics (tokens/cache/context/model) always missing for non-default agents #347

Testing

• All 141 existing tests pass ✓
• Build succeeds ✓
• The fix is additive: if agentId is undefined (non-standard sessionKey), it gracefully degrades to the old behavior

[CLAassistant]

All committers have signed the CLA.

[smallmj]

为什么删除 fallback 逻辑

PR #386 原本包含了 fallback 机制：当在当前 agent 的 session 文件中找不到 metrics 时，尝试去 default agent (main) 的 session 文件中查找。

问题在于： 这个 fallback 找到了错误的数据。

经过本地验证：

• 每个 agent 的 metrics 正确写入了自己的 session 文件（如 的 metrics 在 ）
• 但 fallback 会去 的 session 文件中查找，并返回找到的数据
• 导致所有非 main agent 都显示 main agent 的 metrics 值

结论： fallback 是冗余且有害的。 路由机制已经能正确将读操作定向到对应 agent 的 session 文件，不需要 fallback 来读取其他 agent 的数据。

删除 fallback 后，每个 agent 现在显示的是自己真实的 metrics 值。

[smallmj]

This PR has been replaced by the new PR #422 which is based on the latest main branch with a cleaner history.

The fix in #422 has been locally verified to work correctly - each non-default agent now shows its own metrics instead of all showing the same values from the main agent.

Please close this PR in favor of #422. Thanks!