feat(workspaces): star toggle for concurrency priority

Backend (feature/workspace-star) shipped Workspace.starred: boolean (additive
to [email protected], no version bump) + PUT/DELETE /workspaces/:id/star endpoints
(no body; create-on-miss; return the updated Workspace). A starred workspace's
agents jump ahead of non-starred ones in the concurrency limiter queue
(oldest-agent-first within each group); takes effect immediately for
already-queued agents.

FE consumed:
- adapter/http.ts: star(id)/unstar(id) -> WorkspaceResult<Workspace>
  (PUT/DELETE /workspaces/:id/star, no body).
- logic/view-model.ts: pure sortWorkspaces (starred-first, then lastActivityAt
  desc, stable) + pure applyStarred (the optimistic apply/revert transform).
- store.svelte.ts: setStarred(id, starred) — optimistic flip with error revert;
  the list is now a $derived sorted view (starred bubble to top reactively);
  no full refresh on success (avoids flicker).
- ui/WorkspaceCard.svelte: star toggle button (filled gold when starred,
  outline when not; spinner in flight; aria-pressed/aria-label; tooltip notes
  concurrency priority).
- Re-mirrored .dispatch/wire.reference.md (starred + delta note).
- GLOSSARY.md: 'starred' term.

Tests (+27): http star/unstar (5), view-model sort+applyStarred (12), store
optimistic+revert+re-sort (6), WorkspaceCard star button (4).

Verification: typecheck 0/0, 1045 tests green, biome clean, build OK.
backend-handoff.md updated (workspace-star slice, no open backend asks).

1 files changed, 1 insertions, 0 deletions

diff --git a/GLOSSARY.md b/GLOSSARY.md
index 14b81d1..4ca083c 100644
--- a/GLOSSARY.md
+++ b/GLOSSARY.md
@@ -50,3 +50,4 @@
 | **unload** | Drop the oldest COMMITTED chunks from the in-memory transcript (and DOM) past the **chat limit** — in BULK (`ceil(limit/4)` per pass, deferred while the reader is scrolled up), never one-per-delta (old Dispatch's scroll-jump bug). Purely local: the IndexedDB cache and the server keep everything; `TranscriptState.hiddenBeforeSeq` is the watermark. Distinct from the conversation-cache's cross-conversation **eviction**. | evict (reserved for the cross-conversation cache), prune, drop |
 | **show earlier** | The affordance at the top of a transcript with unloaded history ("Show earlier messages"): pages one unload-unit back in — local cache first, then the server (CR-5 `?beforeSeq=&limit=`) when the cache doesn't reach far enough back — preserving the reader's scroll position. Offered whenever the loaded window starts above seq 1 (the [email protected] 1-based gap-free seq contract). | load more, pagination |
 | **workspaces** | A URL-driven grouping of conversations that owns a **default cwd**. The root path `/` lists workspaces; `/<id>` opens one (visiting a nonexistent id creates it — create-on-miss). Each conversation belongs to exactly one workspace; the always-present `"default"` workspace is the fallback for unassigned/legacy conversations. Tabs are scoped per workspace (filtered client-side). Backend-owned (`[email protected]` `Workspace`); a conversation's cwd inherits `workspace.defaultCwd` when its own is unset. Distinct from the per-conversation cwd+LSP module (`features/cwd-lsp`, formerly `features/workspace`). | project, space |
+| **starred** | A workspace flag (`Workspace.starred: boolean`, defaults `false`) that grants its agents PRIORITY in the concurrency limiter queue — they jump ahead of agents from non-starred workspaces, oldest-agent-first within each group. Takes effect immediately for already-queued agents (backend-owned). Toggled via dedicated `PUT`/`DELETE /workspaces/:id/star` endpoints (no body; create-on-miss; `PUT /workspaces/:id` does NOT accept `starred`). The FE sorts starred workspaces to the top of the home list (the display echo of their concurrency priority) and toggles optimistically with error revert. | favorited, pinned (and do NOT call it "priority" — priority is the EFFECT, starred is the FLAG) |