Send field-specific context for session metadata regen

[arul28]

Summary

• Status-only regenerate now sends lane name, chat title, worktree folder, and the last assistant paragraphs — not the full transcript, sibling threads, or git dump — and copies the current title and lane name unchanged.
• Title-only still uses this thread's transcript; lane-name still uses sibling threads plus git vs remote. Work surfaces shimmer the requested fields in place while generation runs.
• Lane-name-only no longer stamps this chat's kickoff slug onto the shared lane when models miss.

Test plan

• sessionNaming.test.ts — lean status-only prompt, title-only omits git, field-aware system prompt
• sessionMetadataService.test.ts — gather skips, title-only fallback uses transcript, lane-only does not rename from kickoff
• SessionCard.test.tsx / WorkSurfaceHeader.test.tsx / SessionListPane.test.tsx — in-place Naming… / Writing status… masks
• agentChatService.test.ts -t regenerateSessionMetadata

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Note

Medium Risk
Changes lane rename inputs (git + sibling threads) and fallback behavior when AI is unavailable; UI is mostly ephemeral loading state, but wrong lane naming could affect shared lane identity.

Overview
Session metadata regeneration now gathers context and builds prompts based on which fields the user asked to refresh (title, lane name, status line), while still returning all three JSON fields in one model call.

• Title uses this thread’s clipped full transcript; status uses a lean prompt with lane/chat/worktree identity plus the last 2–3 assistant paragraphs (not the full transcript, sibling threads, or git); lane name uses other threads in the lane plus git diff vs baseRef (commits, changed files, uncommitted).
• System prompts and user prompts tell the model to copy unchanged fields when only a subset is requested. Deterministic fallback no longer applies the kickoff slug to lane-name-only regen when models are unavailable (title fallback can still use conversation text).

Work UI tracks in-flight regen per session/field via sessionMetadataGeneratingStore, masking title, lane, and status with the same “Naming …” shimmer used for auto-created lanes (useLaneNamePending merges auto-create and explicit lane-name regen).

Docs for chat metadata and terminals surfaces are updated to match.

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Project	Deployment	Actions	Updated (UTC)
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📥 Commits

Reviewing files that changed from the base of the PR and between 48a1e15 and 4705872.

⛔ Files ignored due to path filters (3)

• docs/features/chat/README.md is excluded by !docs/**
• docs/features/terminals-and-sessions/README.md is excluded by !docs/**
• docs/features/terminals-and-sessions/ui-surfaces.md is excluded by !docs/**

📒 Files selected for processing (16)

• apps/desktop/src/main/services/chat/agentChatService.ts
• apps/desktop/src/main/services/chat/sessionMetadataService.test.ts
• apps/desktop/src/main/services/chat/sessionMetadataService.ts
• apps/desktop/src/main/services/chat/sessionNaming.test.ts
• apps/desktop/src/main/services/chat/sessionNaming.ts
• apps/desktop/src/renderer/components/terminals/LaneChip.tsx
• apps/desktop/src/renderer/components/terminals/LaneNamingLabel.tsx
• apps/desktop/src/renderer/components/terminals/SessionCard.test.tsx
• apps/desktop/src/renderer/components/terminals/SessionCard.tsx
• apps/desktop/src/renderer/components/terminals/SessionContextMenu.tsx
• apps/desktop/src/renderer/components/terminals/SessionListPane.tsx
• apps/desktop/src/renderer/components/terminals/TerminalsPage.tsx
• apps/desktop/src/renderer/components/work/WorkSurfaceHeader.test.tsx
• apps/desktop/src/renderer/components/work/WorkSurfaceHeader.tsx
• apps/desktop/src/renderer/index.css
• apps/desktop/src/renderer/state/sessionMetadataGeneratingStore.ts

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