Ship stable file-backed Cowork workspace

[gitcommit90]

Outcome

Ships 1Helm 0.0.17 with an app-wide continuity contract, a traditional Files browser, Quick Note, and Cowork as the direct visual editing plane for the channel's existing /workspace files.

Acceptance ledger

1. Preserves focused inputs, cursor selections, drafts, scroll positions, expanded details, active panels, and retained Files/Cowork DOM across background messages, polling, and shell paints.
2. Removes the visible Call Skipper button; @Skipper remains the direct path.
3. Uses the shared Markdown renderer across global/channel Threads, Board, summaries, messages, Cowork chat, Memory, Texts, and Activity, including spaced bold labels.
4. Replaces robotic Photon phone-number labels with concise human-facing text.
5. Adds a subtle listening waveform and resident working/waiting orb with reduced-motion support.
6. Gives folders and files distinct, type-aware icons and non-color-only selection.
7. Rebuilds Files as a two-pane browser with breadcrumb, search, sort, metadata, create/upload/open/rename/move/duplicate/delete/download, and nested navigation.
8. Tracks the real visible viewport, releases the mobile composer when scrolling away, respects safe areas, and compacts mobile Settings navigation.
9. Replaces the header Notes action with compact Quick Note capture into /workspace/notes, including collision-safe filenames, dictation, saved/collapsed drafts, and keyboard controls.
10. Replaces the Notes tab with Cowork modes for Notes, Whiteboard, Code, Docs, and Presentations over /workspace/{notes,whiteboards,code,docs,presentations}. The lightweight whiteboard and presentation formats are single readable files; no second document store is introduced.
11. Adds a collapsible Cowork resident panel that starts an ordinary channel thread, appends the open /workspace/... path to the first message, and can continue in Chat.

Live multi-human cursors/co-viewer auto-participation are not claimed in this release; that item was explicitly conditional in the request.

Verification

• npm run typecheck
• npm run build
• npm test — 117/117 native-world; 104/106 aggregate contracts, two environment-only Chrome skips
• npm run test:onboarding-browser — 20/20
• npm run test:brief-browser — 38/38
• npm run test:feedback-browser — 1/1
• node --test test/cowork-browser.mjs — 1/1
• focused Markdown, Files, mobile, Photon, and workspace contracts — green
• production browser against a disposable copy of production data — 18/18
• git diff --check