fix: allow reassigning already-assigned tasks

[drstrangerujn]

Closes #12 (reassign part — button layout is a separate CSS issue)

What's wrong

claimTask() in task.service.ts only matches tasks with status: "open":

where: { uuid: taskUuid, status: "open" }

But the UI-side check in actions.ts allows both open and assigned:

if (task.status !== "open" && task.status !== "assigned") {
  return { success: false, error: "Task is not available for claiming" };
}

So when you try to reassign a task that's already assigned to someone, the UI says "go ahead" but the service layer says "nope" — Prisma can't find a matching row and throws P2025, which becomes AlreadyClaimedError.

Fix

where: { uuid: taskUuid, status: { in: ["open", "assigned"] } }

Now reassigning works. If the task is in any other status (in_progress, to_verify, done, closed), it still correctly rejects.

Tests

• Updated existing test assertion to match the new where filter
• Added a new test case: "reassigns an already-assigned task to a different agent"
• All 81 tests pass

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	96.74% (🎯 95%)	2051 / 2120
🔵	Statements	95.8% (🎯 95%)	2217 / 2314
🔵	Functions	95.07% (🎯 93%)	425 / 447
🔵	Branches	88.33% (🎯 85%)	1348 / 1526

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/services/task.service.ts	89.78%	83.5%	87.27%	91.21%	297, 300, 315-330, 336-340, 342-346, 479-481, 583, 667-713, 921, 924, 945, 995

Generated in workflow #332 for commit c452520 by the Vitest Coverage Report Action

[ChenNima]

LGTM. Real bug — UI and MCP callers allow assigned status but service layer only matched open. Fix is correct and minimal. Tests look good.

Minor nits (non-blocking):

• task.service.ts:589 comment still says "only succeeds if status is open" — could update to include "assigned"
• developer.ts:20 MCP tool description "(open -> assigned)" could mention reassign