Auto-attach agent deliverables to the originating Linear issue

[alicejt]

What this does

When an issue-bound agent session completes, the deliverable files the agent created or modified in its worktree are uploaded to Linear and attached to the originating issue — so the work is one click away on the issue instead of buried in a git branch or PR.

How it works

• deliverables.ts — pure, unit-tested helpers: DELIVERABLE_EXTENSIONS (documents + images: .md, .pdf, .docx, .csv, .xlsx, .png, …), parseGitPorcelain, filterDeliverables (extension allowlist + excludes node_modules/dist/build/coverage, lockfiles, dotfiles, CHANGELOG.md), contentTypeForFile.
• GitService.detectDeliverables(worktreePath) — runs git status --porcelain, filters, resolves to existing absolute paths. Best-effort: a git failure returns [] rather than throwing.
• IIssueTrackerService.createAttachment + AttachmentCreateRequest/AttachmentCreateResponse — implemented in LinearIssueTrackerService (Linear attachmentCreate mutation), stubbed in CLIIssueTrackerService. (requestFileUpload already existed.)
• AgentSessionManager gains an optional onSessionDeliverables hook, fired after addResultEntry on successful completion, wrapped so a failure never blocks the session.
• EdgeWorker.handleSessionDeliverables — detect → requestFileUpload → PUT bytes → createAttachment, per file.

Safety / scope

• Worktree-only. Worktree-free sessions (Slack, and the Project Update chat sessions) no-op immediately.
• Best-effort. Every failure is logged and swallowed — a session always completes normally.
• Files > 10 MB are skipped (Linear's per-file limit); the batch is capped at 10 files.
• Issue-bound sessions only; requires the session to resolve to a Linear issue + tracker.

Testing

• 15 unit tests for the detection/filter helpers (porcelain parsing, extension allowlist, noise exclusion, MIME mapping).
• pnpm build + pnpm typecheck clean across the monorepo; full edge-worker suite shows no new failures (the pre-existing runner-selection / screenshot-upload-hooks failures on main are unrelated).

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