feat: capture_work — braindump → decomposed issues → filed in gitea (P4)

The last big agent capability. In the Capture screen, a rough braindump runs real
big-model decomposition into a small, estimated issue set; you review/edit the
labels and approve, and the issues are opened in gitea. This is the one place the
big model earns its keep (docs/agent-tools.md).

core (@commitea/core):
- capture-work: PROPOSE_ISSUES_TOOL + CAPTURE_SYSTEM; captureWork(complete, dump)
  forces a single structured decomposition and returns validated issues; parseCaptureArgs
  drops blank titles + invalid est/p labels. ProposedIssue / CaptureProposal.
- gitea client: createIssue({title, body?, labelIds?}) → POST /issues, normalized.

app:
- model bridge model:capture runs captureWork on the (loaded) big model.
- gitea bridge gitea:createIssues opens each approved issue with its est/* + p/*
  labels (reusing the #41 label-id resolver — zero-pollution, no invented labels).
- Capture screen: when a model is configured, "Brew tickets" runs real capture and
  "Approve all" files the set; otherwise the scripted demo interview runs. Fixed a
  race — the brew handler re-checks model status at click time so a configured
  model never falls into the scripted path before status resolves.

Verified: 108 core tests green (7 capture + createIssue added), desktop typecheck
clean, 14 fixture e2e green. Gated live e2e against gemma-4-26b: the auth braindump
→ 3 real tickets ("Resolve token refresh + session staleness" est/3d p/1, "Fix
webhook double-firing" est/2d p/2, "Write auth setup docs" est/1d p/3), reviewable
and editable; Discard so the test files nothing (createIssue POST is unit-tested).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/core/src/gitea/client.ts

@@ -103,6 +103,8 @@ export interface GiteaClient {
   listLabels(): Promise<GiteaLabel[]>
   /** Replace an issue's entire label set with the given label ids. Write. */
   setIssueLabels(index: number, labelIds: number[]): Promise<void>
+  /** Open a new issue with a title, optional body, and label ids. Write. */
+  createIssue(input: { title: string; body?: string; labelIds?: number[] }): Promise<GiteaIssue>
 }
 
 /** Map raw gitea issue JSON to the normalized domain shape. Pure. */
@@ -222,5 +224,13 @@ export function createGiteaClient(config: GiteaConfig, fetchImpl: FetchLike): Gi
     async setIssueLabels(index, labelIds) {
       await request(`/issues/${index}/labels`, { method: 'PUT', body: { labels: labelIds } })
     },
+
+    async createIssue(input) {
+      const raw = (await request('/issues', {
+        method: 'POST',
+        body: { title: input.title, body: input.body ?? '', labels: input.labelIds ?? [] },
+      })) as RawIssue
+      return normalizeIssue(raw)
+    },
   }
 }