feat(chat): Comments and review in VS Code, like the OpenChamber desktop app (#1724)

* feat(chat): render code comments as cards instead of fenced text

* fix(vscode): route Add Comment to the active session editor panel

* fix(chat): persist queued inline comments and tighten file-chip path matching

* feat(vscode): comment on code from the editor

* fix(chat): keep attached context in the message and broadcast comment removal

* fix(vscode): hold every pending comment and gate both entry points on the workspace

* fix(vscode): let only the owning surface decide its comment threads

* fix(vscode): drop a comment removed while its delivery was still in flight

* test(vscode): cover the in-flight comment removal guard

* test(vscode): cover comment removal reaching every chat surface

* fix(vscode): give up on a comment the chat never confirmed holding

* fix(vscode): retract a comment everywhere before reporting it discarded

* fix(chat): preserve queued comment cards

* fix: preserve inline comment context across send paths

* fix(chat): preserve command routing with context

* fix(chat): keep unavailable actions on normal send path

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/vscode/README.md

@@ -42,6 +42,7 @@ Select code in the editor, right-click, and find the **OpenChamber** submenu:
 | Action | Description |
 |--------|-------------|
 | Add to Context | Attach selection to your next prompt |
+| Add Comment | Open a comment thread on the selected lines. The comment stays anchored in the editor and goes out with your next message as a context card. The gutter `+` does the same once the extension is active |
 | Explain | Ask the agent to explain the selected code |
 | Improve Code | Ask the agent to improve the selection in-place |