feat(work): A-class UI surfaces + B.6 SubAgent acceptance/reviewer 闭环

[TYRMars]

Summary

This PR closes the A-class UI 串联缺口 (5 surfaces) and the B-class SubAgent acceptance policy + reviewer auto-accept loop end-to-end.

A class — UI 串联缺口 (5/5)

1. Auto-mode dashboard (/projects/auto-mode)

Backend now exposes scheduler liveness; new page makes it actionable.

• Backend
  • Extended GET /v1/auto-mode payload: now returns mode, tick_seconds, max_concurrent_units, available_permits, last_tick_at, max_units_per_tick, max_retries, run_timeout_ms, allow_unassigned, default_assignee alongside the legacy enabled / configured
  • AutoModeRuntime::record_tick() stamps wall-clock time on every tick (regardless of enable flag — operators can see "loop alive, just paused")
  • New GET /v1/diagnostics/runs/recent?limit=N reusing existing RequirementRunStore::list_all, sorted by finished_at (or started_at for in-flight)
  • AppState.auto_mode_config: Option<Arc<AutoModeConfig>> snapshot stashed at boot
• Frontend (AutoModeDashboardPage.tsx)
  • Scheduler header strip (toggle + read-only config + available_permits / max_concurrent_units gauge + last-tick relative time)
  • 5 panels: in-flight runs / recent runs / recent failures (with Retry → mints fresh run) / Pending triage (cross-project) / Blocked-or-waiting (client-side derivation: missing assignee, unmet deps, retries exhausted)
  • Per-run detail drawer (GET /v1/runs/:id): logs, usage, error, verification
  • 5s poll + window-focus refresh
  • Sidebar nav "自动调度 / Auto-mode" + WorkOverview header link

2. Triage 增量

• TriageDrawer 新增 "全部通过 (N)" 按钮 (parallel approveRequirement, confirm before)
• Cross-project Pending triage panel in Auto-mode dashboard with deeplink to project kanban

3. Conversation history (/conversations + /conversations/:id)

• New full-page archive: search box + project filter + date grouping (reuses convoGroupLabel)
• Click row → resumeConversation(id) then navigate to /
• /conversations/:id deep-link: resume + redirect (clean browser history, no junk page)
• Sidebar nav "全部会话 / All conversations"

4. Worktree management (/projects/worktrees)

• Reuses existing /v1/diagnostics/worktrees/orphans + /cleanup
• Lists orphans with size (auto KiB / MiB / GiB), modified-time, run id
• Red Cleanup button with confirm; renders last-cleanup report (removed / failed)
• 15s poll + window-focus refresh + clear empty/disabled/error states
• Sidebar nav "Worktree 管理 / Worktrees"

5. Plan-mode chat UX

• Investigation showed backend + frontend were 95% wired (PlanProposedCard, accept_plan / refine_plan frames, requirementhttp.review_verdict tool — all in place)
• The gap: when user switched to Plan but no plan was proposed yet, no UI feedback existed
• New PlanModeBanner mirrors BypassBanner: visible when permissionMode==="plan" && !proposedPlan, with Exit plan mode button (→ ask)

B.6 SubAgent — acceptance policy 全栈闭环

Requirement.acceptance_policy (Subagent / Human) frontend wiring

The field shipped on harness-core months ago but had no UI surface and was inert at runtime. This PR makes it real.

• Backend (requirements_routes.rs)
  • PATCH /v1/requirements/:id accepts acceptance_policy: "subagent" | "human" — invalid value → 400
  • Activity row written when policy flips: Comment{kind:"acceptance_policy_change", from, to}
• Frontend
  • AcceptancePolicy type + Requirement.acceptance_policy? field in types/frames.ts
  • updateRequirement(id, { acceptance_policy }) in services/requirements.ts
  • AcceptancePolicyRow (Select + hint) in RequirementDetail.tsx
  • Orange "人工验收 / human review" badge on kanban card when acceptance_policy === "human"

auto_mode 真正读 acceptance_policy

• completed_requirement_target_status 在 Human policy 下停在 Review 而非 Done
• tick eligibility filter 跳过 Human policy 的 Review 行 (避免 picker 无限重选)

Reviewer auto-accept dispatch (opt-in via JARVIS_REVIEWER_AUTO_ACCEPT)

• Off by default — existing deployments keep pre-v1.0 auto-flip semantics
• When enabled: Subagent policy + Completed run → row holds at Review + dispatches subagent.review from state.tools with {task, context: {requirement_id, run_id, verification_plan, work_summary}}
• Reviewer subagent's terminal call to existing requirement.review_verdict tool flips Review → Done (pass) or Review → InProgress (fail) with commentary attached
• 2 new Activity rows: Comment{kind:"reviewer_dispatched"} + Comment{kind:"reviewer_dispatch_failed", error} if dispatch errors out (tool missing, etc.)

Tests + quality gates

• 232/232 harness-server unit tests pass
• 6 new tests covering acceptance_policy + reviewer dispatch:
  • tick_skips_human_acceptance_policy_at_review
  • tick_advances_human_policy_in_progress_to_review
  • completed_target_status_respects_acceptance_policy (pure unit, all combinations)
  • advance_dispatches_reviewer_when_flag_enabled_and_policy_subagent (mock reviewer tool)
  • advance_skips_dispatch_when_flag_disabled
  • advance_skips_dispatch_for_human_policy_even_with_flag_enabled
  • dispatch_acceptance_review_errors_when_tool_missing
• cargo clippy --workspace --all-targets -- -D warnings clean
• cargo build -p jarvis succeeds (web bundle baked in via include_dir!)
• All new strings i18n-complete (en + zh)

Note: bundled scaffolding

This PR also bundles in-flight Observability + EvalStore scaffolding (HarnessObservabilityPanel, observability_routes.rs, EvalStore trait, harness-store backend additions, self-improving-agent.zh-CN.md proposal) that was already in the working tree. Those changes were entangled with state.rs / routes.rs / lib.rs hunks and couldn't be cleanly separated at the file level. They build + test cleanly but are scaffolding only — full OTel/eval wiring is a separate workstream tracked under feat/OTel.

Test plan

• Cold-start the binary with no env vars; visit /projects/auto-mode — page loads, scheduler shows "configured: false" or "paused" depending on env
• Set JARVIS_WORK_MODE=auto JARVIS_WORK_TICK_SECONDS=5; restart; dashboard shows mode=auto, tick=5s, last_tick updates every 5s
• Visit /conversations; search + project filter behave; clicking a row resumes
• Visit /projects/worktrees; empty state when worktree feature off; cleanup button when orphans exist
• In a project kanban, open a Requirement detail; flip Acceptance to "Human review only"; the kanban card grows the "人工验收" badge
• With JARVIS_REVIEWER_AUTO_ACCEPT unset, complete a Subagent-policy requirement → row flips to Done (current behavior)
• With JARVIS_REVIEWER_AUTO_ACCEPT=1, same scenario → row holds at Review and subagent.review is invoked (visible in Activity timeline as reviewer_dispatched)
• In chat, switch permission mode to "Plan" → blue banner appears; click "Exit plan mode" → switches back to Ask, banner unmounts

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