[codex] Add structured issue-thread interactions (#4244)

## Thinking Path

> - Paperclip orchestrates AI agents for zero-human companies.
> - Operators supervise that work through issues, comments, approvals,
and the board UI.
> - Some agent proposals need structured board/user decisions, not
hidden markdown conventions or heavyweight governed approvals.
> - Issue-thread interactions already provide a natural thread-native
surface for proposed tasks and questions.
> - This pull request extends that surface with request confirmations,
richer interaction cards, and agent/plugin/MCP helpers.
> - The benefit is that plan approvals and yes/no decisions become
explicit, auditable, and resumable without losing the single-issue
workflow.

## What Changed

- Added persisted issue-thread interactions for suggested tasks,
structured questions, and request confirmations.
- Added board UI cards for interaction review, selection, question
answers, and accept/reject confirmation flows.
- Added MCP and plugin SDK helpers for creating interaction cards from
agents/plugins.
- Updated agent wake instructions, onboarding assets, Paperclip skill
docs, and public docs to prefer structured confirmations for
issue-scoped decisions.
- Rebased the branch onto `public-gh/master` and renumbered branch
migrations to `0063` and `0064`; the idempotency migration uses `ADD
COLUMN IF NOT EXISTS` for old branch users.

## Verification

- `git diff --check public-gh/master..HEAD`
- `pnpm exec vitest run packages/adapter-utils/src/server-utils.test.ts
packages/mcp-server/src/tools.test.ts
packages/shared/src/issue-thread-interactions.test.ts
ui/src/lib/issue-thread-interactions.test.ts
ui/src/lib/issue-chat-messages.test.ts
ui/src/components/IssueThreadInteractionCard.test.tsx
ui/src/components/IssueChatThread.test.tsx
server/src/__tests__/issue-thread-interaction-routes.test.ts
server/src/__tests__/issue-thread-interactions-service.test.ts
server/src/services/issue-thread-interactions.test.ts` -> 9 files / 79
tests passed
- `pnpm -r typecheck` -> passed, including `packages/db` migration
numbering check

## Risks

- Medium: this adds a new issue-thread interaction model across
db/shared/server/ui/plugin surfaces.
- Migration risk is reduced by placing this branch after current master
migrations (`0063`, `0064`) and making the idempotency column add
idempotent for users who applied the old branch numbering.
- UI interaction behavior is covered by component tests, but this PR
does not include browser screenshots.

> 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-class coding agent runtime. Exact model ID and
context window are not exposed in this Paperclip run; tool use and local
shell/code execution were enabled.

## 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
- [ ] 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/shared/src/index.ts

@@ -16,6 +16,9 @@ export {
   INBOX_MINE_ISSUE_STATUSES,
   INBOX_MINE_ISSUE_STATUS_FILTER,
   ISSUE_PRIORITIES,
+  ISSUE_THREAD_INTERACTION_KINDS,
+  ISSUE_THREAD_INTERACTION_STATUSES,
+  ISSUE_THREAD_INTERACTION_CONTINUATION_POLICIES,
   ISSUE_ORIGIN_KINDS,
   ISSUE_RELATION_TYPES,
   ISSUE_CONTINUATION_SUMMARY_DOCUMENT_KEY,
@@ -105,6 +108,9 @@ export {
   type AgentIconName,
   type IssueStatus,
   type IssuePriority,
+  type IssueThreadInteractionKind,
+  type IssueThreadInteractionStatus,
+  type IssueThreadInteractionContinuationPolicy,
   type BuiltInIssueOriginKind,
   type PluginIssueOriginKind,
   type IssueOriginKind,
@@ -300,6 +306,28 @@ export type {
   IssueExecutionStagePrincipal,
   IssueExecutionDecision,
   IssueComment,
+  IssueThreadInteractionActorFields,
+  SuggestedTaskDraft,
+  SuggestTasksPayload,
+  SuggestTasksResultCreatedTask,
+  SuggestTasksResult,
+  AskUserQuestionsQuestionOption,
+  AskUserQuestionsQuestion,
+  AskUserQuestionsPayload,
+  AskUserQuestionsAnswer,
+  AskUserQuestionsResult,
+  RequestConfirmationIssueDocumentTarget,
+  RequestConfirmationCustomTarget,
+  RequestConfirmationTarget,
+  RequestConfirmationPayload,
+  RequestConfirmationResult,
+  IssueThreadInteractionBase,
+  SuggestTasksInteraction,
+  AskUserQuestionsInteraction,
+  RequestConfirmationInteraction,
+  IssueThreadInteraction,
+  IssueThreadInteractionPayload,
+  IssueThreadInteractionResult,
   IssueDocument,
   IssueDocumentSummary,
   DocumentRevision,
@@ -555,6 +583,27 @@ export {
   issueExecutionWorkspaceSettingsSchema,
   checkoutIssueSchema,
   addIssueCommentSchema,
+  issueThreadInteractionStatusSchema,
+  issueThreadInteractionKindSchema,
+  issueThreadInteractionContinuationPolicySchema,
+  suggestedTaskDraftSchema,
+  suggestTasksPayloadSchema,
+  suggestTasksResultCreatedTaskSchema,
+  suggestTasksResultSchema,
+  askUserQuestionsQuestionOptionSchema,
+  askUserQuestionsQuestionSchema,
+  askUserQuestionsPayloadSchema,
+  askUserQuestionsAnswerSchema,
+  askUserQuestionsResultSchema,
+  requestConfirmationIssueDocumentTargetSchema,
+  requestConfirmationCustomTargetSchema,
+  requestConfirmationTargetSchema,
+  requestConfirmationPayloadSchema,
+  requestConfirmationResultSchema,
+  createIssueThreadInteractionSchema,
+  acceptIssueThreadInteractionSchema,
+  rejectIssueThreadInteractionSchema,
+  respondIssueThreadInteractionSchema,
   linkIssueApprovalSchema,
   createIssueAttachmentMetadataSchema,
   createIssueWorkProductSchema,
@@ -580,6 +629,10 @@ export {
   type UpdateIssue,
   type CheckoutIssue,
   type AddIssueComment,
+  type CreateIssueThreadInteraction,
+  type AcceptIssueThreadInteraction,
+  type RejectIssueThreadInteraction,
+  type RespondIssueThreadInteraction,
   type LinkIssueApproval,
   type CreateIssueAttachmentMetadata,
   type CreateIssueWorkProduct,