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gsxdsm 2797803c0b FN-7503: add agent log timing metrics

Record and surface request first-token latency and tool processing duration in task logs.

- Add optional agent log timing fields and persist them in file-backed task logs.
- Track Time To First Token from the first visible model output per agent logger request.
- Track FIFO tool durations for tool result and error rows without storing sensitive payloads.
- Render TTFT and duration badges in task chat and agent log viewers with regression coverage.
- Document the new persisted timing fields and add a patch changeset for the CLI package.

Files changed:
 .changeset/fn-7503-agent-log-timing.md             |   7 ++
 docs/storage.md                                    |   1 +
 .../src/__tests__/agent-log-file-store.test.ts     |  35 ++++++
 .../src/__tests__/store-agent-log-file.test.ts     |  28 +++++
 packages/core/src/agent-log-file-store.ts          |  19 ++++
 packages/core/src/store.ts                         |  13 +++
 packages/core/src/types.ts                         |   4 +
 .../dashboard/app/components/AgentLogViewer.css    |  33 ++++++
 .../dashboard/app/components/AgentLogViewer.tsx    |  39 ++++++-
 packages/dashboard/app/components/TaskChatTab.css  |  23 +++-
 packages/dashboard/app/components/TaskChatTab.tsx  |  17 ++-
 .../__tests__/AgentLogViewer.rendering.test.tsx    |  24 +++++
 .../app/components/__tests__/TaskChatTab.test.tsx  |  18 ++++
 packages/engine/src/__tests__/agent-logger.test.ts | 120 ++++++++++++++++++---
 packages/engine/src/agent-logger.ts                |  97 ++++++++++++++---
 15 files changed, 446 insertions(+), 32 deletions(-)

Fusion-Task-Id: FN-7503

Fusion-Task-Lineage: 7e62034f-4c35-420d-a670-3f7f4a7948df

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-04 10:42:21 -07:00