Add planning mode for issue work (#5353)

## Thinking Path

> - Paperclip is a control plane for autonomous AI companies.
> - Issues are the core unit of work, and issue comments are how board
users and agents coordinate execution.
> - Some issue conversations need to produce plans and approvals instead
of immediate implementation work.
> - The existing issue contract did not distinguish standard execution
comments from planning-oriented issue work.
> - This pull request adds an issue work-mode contract and board UI
affordances for standard vs planning mode.
> - The benefit is that planning-mode issues can be created, displayed,
discussed, and carried through agent heartbeat context without losing
the normal issue workflow.

## What Changed

- Added `standard` / `planning` issue work-mode contracts across DB,
shared validators/types, server issue flows, plugin protocol, and
adapter heartbeat payloads.
- Added an idempotent `0081_optimal_dormammu` migration for
`issues.work_mode`, ordered after current `public-gh/master` migrations.
- Updated heartbeat/context summaries and issue-thread interaction
behavior so planning work mode is preserved when creating suggested
follow-up issues.
- Added UI support for planning-mode issue creation, issue rows, detail
composer styling, and composer work-mode toggles.
- Added focused server/shared/UI tests plus a Playwright visual
verification spec for planning-mode surfaces.
- Rebased the branch onto current `public-gh/master` and added durable
planning-mode screenshots under `doc/assets/pap-3368/`.

## Verification

- `pnpm --filter @paperclipai/db run check:migrations`
- `pnpm exec vitest run --project @paperclipai/shared
packages/shared/src/validators/issue.test.ts`
- `pnpm exec vitest run --project @paperclipai/server
server/src/__tests__/heartbeat-context-summary.test.ts
server/src/__tests__/issue-thread-interactions-service.test.ts
server/src/__tests__/issues-goal-context-routes.test.ts --pool=forks
--poolOptions.forks.isolate=true`
- `pnpm exec vitest run --project @paperclipai/ui
ui/src/components/IssueChatThread.test.tsx
ui/src/components/NewIssueDialog.test.tsx
ui/src/components/IssueRow.test.tsx ui/src/pages/IssueDetail.test.tsx`
- `pnpm exec vitest run --project @paperclipai/adapter-utils
packages/adapter-utils/src/server-utils.test.ts`
- `PAPERCLIP_E2E_SKIP_LLM=true npx playwright test --config
tests/e2e/playwright.config.ts
tests/e2e/planning-mode-visual-verification.spec.ts`

## Screenshots

Desktop planning detail:

![Desktop planning
detail](https://raw.githubusercontent.com/paperclipai/paperclip/PAP-3368-plan-a-planning-mode-for-issues/doc/assets/pap-3368/desktop-planning-detail.png)

Desktop planning row:

![Desktop planning
row](https://raw.githubusercontent.com/paperclipai/paperclip/PAP-3368-plan-a-planning-mode-for-issues/doc/assets/pap-3368/desktop-planning-row.png)

Desktop staged standard toggle:

![Desktop staged standard
toggle](https://raw.githubusercontent.com/paperclipai/paperclip/PAP-3368-plan-a-planning-mode-for-issues/doc/assets/pap-3368/desktop-standard-toggle.png)

Mobile planning detail:

![Mobile planning
detail](https://raw.githubusercontent.com/paperclipai/paperclip/PAP-3368-plan-a-planning-mode-for-issues/doc/assets/pap-3368/mobile-planning-detail.png)

Mobile planning row:

![Mobile planning
row](https://raw.githubusercontent.com/paperclipai/paperclip/PAP-3368-plan-a-planning-mode-for-issues/doc/assets/pap-3368/mobile-planning-row.png)

## Risks

- Medium migration risk: this adds a non-null issue column. The
migration uses `ADD COLUMN IF NOT EXISTS` so installations that applied
an older branch-local migration number can still apply the final
numbered migration safely.
- Medium contract risk: issue payloads, plugin payloads, and adapter
heartbeat payloads now include work mode; compatibility is handled by
defaulting missing values to `standard`.
- UI risk is moderate because composer controls changed; focused
component tests and visual e2e coverage exercise standard vs planning
display and toggle behavior.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- OpenAI Codex, GPT-5 coding agent in a local Paperclip worktree, with
shell/tool use. Exact context-window size is not exposed in this
runtime.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] If this change affects the UI, I have included before/after
screenshots
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge

---------

Co-authored-by: Paperclip <noreply@paperclip.ing>

packages/adapters/opencode-local/src/server/execute.ts

@@ -40,6 +40,7 @@ import {
   DEFAULT_PAPERCLIP_AGENT_PROMPT_TEMPLATE,
   runChildProcess,
   readPaperclipRuntimeSkillEntries,
+  readPaperclipIssueWorkModeFromContext,
   resolvePaperclipDesiredSkillNames,
 } from "@paperclipai/adapter-utils/server-utils";
 import { isOpenCodeUnknownSessionError, parseOpenCodeJsonl } from "./parse.js";
@@ -266,7 +267,9 @@ export async function execute(ctx: AdapterExecutionContext): Promise<AdapterExec
     ? context.issueIds.filter((value): value is string => typeof value === "string" && value.trim().length > 0)
     : [];
   const wakePayloadJson = stringifyPaperclipWakePayload(context.paperclipWake);
+  const issueWorkMode = readPaperclipIssueWorkModeFromContext(context);
   if (wakeTaskId) env.PAPERCLIP_TASK_ID = wakeTaskId;
+  if (issueWorkMode) env.PAPERCLIP_ISSUE_WORK_MODE = issueWorkMode;
   if (wakeReason) env.PAPERCLIP_WAKE_REASON = wakeReason;
   if (wakeCommentId) env.PAPERCLIP_WAKE_COMMENT_ID = wakeCommentId;
   if (approvalId) env.PAPERCLIP_APPROVAL_ID = approvalId;