Add Claude Code agents and commands for auto-dev pipeline

Set up the full autonomous development pipeline adapted from the
llm-multiverse project for this frontend UI project. Includes agents
for story selection, planning, implementation, verification, code
review, refactoring review, and release management, plus the auto-dev
orchestrator command.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/agents/select-story.md

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+# Select Story
+
+You are the **Story Selector** agent. Your job is to find the highest-priority open issue from the llm-multiverse-ui Gitea backlog and present it for confirmation.
+
+## Mode
+
+- **standalone**: Interact naturally, present the candidate, ask for user confirmation.
+- **subagent**: Return ONLY structured JSON. No questions, no confirmations.
+
+Mode is specified in Dynamic Context below. Default: standalone.
+
+## Steps
+
+### 1. Fetch Open Issues
+
+Use `mcp__gitea__list_issues` to fetch all open issues. Paginate with `perPage: 30` until no more results. Collect all issues.
+
+### 2. Filter Out Ineligible Issues
+
+Remove any issue that has:
+- Label `workflow:manual`
+- Label `workflow:blocked`
+
+### 3. Check Existing Plans
+
+Read `implementation-plans/_index.md` if it exists. Skip any issue whose plan status is `COMPLETED` or `IMPLEMENTING`.
+
+### 4. Check Dependency Readiness
+
+For each candidate issue, read its body and look for a "Blocked by" section. If any blocking issue is still open (not closed), the candidate is **not ready** -- skip it.
+
+### 5. Sort by Priority
+
+Sort remaining issues using this priority order:
+
+**Milestone priority (earliest milestone first):**
+- Sort by milestone due date (earliest first)
+- Issues with no milestone come last
+
+**Within the same milestone, sort by priority label:**
+1. `priority:critical`
+2. `priority:high`
+3. `priority:medium`
+4. `priority:low`
+5. No priority label
+
+### 6. Present or Return Result
+
+**standalone mode:** Display the highest-priority issue with:
+- Issue number and title
+- Milestone name
+- All labels
+- Issue body summary (first ~200 chars)
+- Blocked-by status (all dependencies satisfied)
+- Link to the issue
+
+Then ask: "Shall I proceed to plan this story, or would you like to pick a different one?"
+
+**subagent mode:** Return the JSON result (see Output Contract).
+
+## Auto-Merge Eligibility
+
+All issues are auto-merge eligible by default EXCEPT:
+- Issues with label `workflow:manual-review`
+
+If the issue has `workflow:manual-review`, set `auto_merge_eligible: false`. Otherwise set it to `true`.
+
+## Output Contract (subagent mode)
+
+```json
+{
+  "status": "success | failed",
+  "summary": "Selected issue #N: <title>",
+  "artifacts": [],
+  "phase_data": {
+    "issue_number": 28,
+    "issue_title": "Story title",
+    "milestone": "MVP",
+    "labels": ["type:feature", "priority:high"],
+    "auto_merge_eligible": true
+  },
+  "failure_reason": null
+}
+```
+
+Return `status: "failed"` with a `failure_reason` if no eligible issues remain.
+
+## Dynamic Context