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gsxdsm 363916926d FN-7995: always persist tool_error detail for Activity feed diagnosis

Always persist bounded tool_error detail so the task Activity feed can surface underlying failure messages even when verbose tool-output persistence is off.

- Keep tool args and successful tool_result detail opt-in via persistAgentToolOutput
- Always include bounded tool_error detail in agent-log JSONL rows
- Document diagnostic retention in types, agent-logger, and storage docs
- Cover Activity reveal behavior and logger persistence with unit tests
- Add patch changeset for operator-facing Activity error detail fix

Files changed:
 .changeset/fn-7995-tool-error-detail.md            |  7 ++++
 docs/storage.md                                    |  1 +
 packages/core/src/agent-log-constants.ts           |  4 +++
 packages/core/src/types.ts                         | 10 ++++--
 .../app/components/__tests__/TaskChatTab.test.tsx  | 42 ++++++++++++++++++++++
 packages/engine/src/__tests__/agent-logger.test.ts | 41 ++++++++++++++++++---
 packages/engine/src/agent-logger.ts                |  9 ++---
 7 files changed, 104 insertions(+), 10 deletions(-)

Fusion-Task-Id: FN-7995

Fusion-Task-Lineage: 0fa063df-58b1-4991-a0d9-e8a77181d32a

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

2026-07-15 16:17:37 -07:00