PBI-47: schema, pause_context Zod, resumePausedSprintRunAction, PAUSED-banner UI (#137)

Scrum4Me-side counterpart of scrum4me-mcp@f7f5a48 (PBI-9 + PBI-47):

- prisma migration: ClaudeJob.{base_sha,head_sha} + SprintRun.pause_context
- lib/pause-context.ts: Zod schema + parsePauseContext + pauseReasonLabel
  helper; single source of truth for the JSON pause_context shape produced
  by the mcp sprint-run flow (MERGE_CONFLICT pause)
- actions/sprint-runs.ts: resumePausedSprintRunAction — separate from the
  existing FAILED-resume flow, requires SprintRun.status === PAUSED, closes
  the linked ClaudeQuestion, clears pause_context, sets RUNNING/QUEUED based
  on whether a claim is still active
- components/sprint/sprint-run-controls.tsx: PAUSED banner with reason label,
  PR link, conflict-files list (max 5 + "+N more"), Resume button with
  confirm() guard
- app/(app)/products/[id]/sprint/page.tsx: load pause_context from active
  SprintRun and pass through to SprintRunControls

All MD3 tokens (warning-container, on-warning-container, primary). No raw
Tailwind utility colours.

Tests: 532 passing across 72 files (Scrum4Me side).

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/(app)/products/[id]/sprint/page.tsx

@@ -7,6 +7,7 @@ import { pbiStatusToApi } from '@/lib/task-status'
 import { SprintBoardClient } from '@/components/sprint/sprint-board-client'
 import { SprintHeader } from '@/components/sprint/sprint-header'
 import { SprintRunControls } from '@/components/sprint/sprint-run-controls'
+import { parsePauseContext } from '@/lib/pause-context'
 import type { SprintStory, PbiWithStories, ProductMember } from '@/components/sprint/sprint-backlog'
 import type { Task } from '@/components/sprint/task-list'
 import { TaskDialog } from '@/app/_components/tasks/task-dialog'
@@ -50,8 +51,13 @@ export default async function SprintBoardPage({ params, searchParams }: Props) {
       sprint_id: sprint.id,
       status: { in: ['QUEUED', 'RUNNING', 'PAUSED'] },
     },
-    select: { id: true, status: true },
+    select: { id: true, status: true, pause_context: true },
+    orderBy: { created_at: 'desc' },
   })
+  const pauseContext =
+    activeSprintRun?.status === 'PAUSED'
+      ? parsePauseContext(activeSprintRun.pause_context)
+      : null
 
   // Sprint stories with full task data and assignee
   const [sprintStories, productMembers] = await Promise.all([
@@ -163,6 +169,7 @@ export default async function SprintBoardPage({ params, searchParams }: Props) {
           sprintStatus={sprint.status}
           activeSprintRunId={activeSprintRun?.id ?? null}
           activeSprintRunStatus={activeSprintRun?.status ?? null}
+          pauseContext={pauseContext}
           isDemo={isDemo}
         />
       </div>