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gsxdsm cc022867be FN-6505: inline chat attachment contents for agents

Chat agents now receive readable attachment content when responding to user prompts.

- Add shared attachment loading and formatting for session and room chat surfaces.
- Inline supported text attachments and forward image attachments through prompt options.
- Cover session and room attachment handling with regression tests and document the behavior.

Files changed:
 .changeset/fuzzy-chat-attachments.md               |   5 +
 docs/dashboard-guide.md                            |   2 +
 .../src/__tests__/chat-attachment-content.test.ts  | 139 ++++++++++++++++++
 .../dashboard/src/__tests__/chat-manager.test.ts   | 123 ++++++++++++++++
 packages/dashboard/src/chat-attachment-content.ts  | 163 +++++++++++++++++++++
 packages/dashboard/src/chat.ts                     |  43 +++++-
 6 files changed, 470 insertions(+), 5 deletions(-)

Fusion-Task-Id: FN-6505

Fusion-Task-Lineage: 9bc7a65c-2516-42a4-8d3c-2bc53ea1c895

2026-06-16 21:09:20 -07:00