[codex] Add document annotations and comments (#6733)

## Thinking Path

> - Paperclip orchestrates AI-agent companies through issues, documents,
runs, and durable company-scoped state.
> - Issue documents are where agents and operators capture plans,
handoffs, and work products.
> - Before this change, document collaboration could only happen through
whole-document edits and detached issue comments.
> - Inline document annotations need stable anchors, revision-aware
persistence, and UI affordances that do not break existing document
editing.
> - This pull request adds company-scoped document annotation threads,
comments, anchor snapshots, API routes, and board UI.
> - The benefit is that operators and agents can discuss specific
document passages without losing context as documents evolve.

## What Changed

- Added document annotation tables, schema exports, shared types,
validators, anchor hashing, and text-anchor helpers.
- Added server-side document annotation services and issue routes for
listing, creating, commenting, resolving, and reopening annotation
threads.
- Included annotation summaries in relevant issue document reads and
backup/recovery document workspace behavior.
- Added React UI for inline document highlights, comment panels, mobile
sheet behavior, deep-link focus, and resolved/open filtering.
- Added annotation design artifacts, Storybook coverage, screenshots,
and a screenshot helper script.
- Rebased the branch onto current `paperclipai/paperclip` `master` and
renumbered the annotation migration from `0085_old_swarm` to
`0091_old_swarm`; the SQL uses `IF NOT EXISTS` guards so environments
that previously applied the old migration number can safely apply the
new one.
- Adjusted the new annotation UI tests to use a local async flush helper
because this workspace's React 19.2.4 export does not expose
`React.act`.

## Verification

- `pnpm run preflight:workspace-links && pnpm exec vitest run
packages/shared/src/document-anchors.test.ts
server/src/__tests__/document-annotation-routes.test.ts
server/src/__tests__/document-annotations-service.test.ts
ui/src/components/DocumentAnnotationLayer.test.tsx
ui/src/components/IssueDocumentAnnotations.test.tsx
ui/src/lib/document-annotation-hash.test.ts
ui/src/lib/document-annotation-selection.test.ts`
- Confirmed `git diff --check` passes.
- Confirmed no `pnpm-lock.yaml` or `.github/workflows/*` files are
included in the PR diff.

## Risks

- Medium risk: this adds new persisted annotation tables and routes
across db/shared/server/ui.
- Migration risk is reduced by moving the branch migration to
`0091_old_swarm` after upstream `0090_resource_memberships` and keeping
the SQL idempotent for old `0085_old_swarm` adopters.
- UI risk is mostly around text range anchoring and panel positioning
across long documents, folded content, and mobile layouts; the PR
includes focused unit coverage and design 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 coding agent, tool-using software engineering
mode. Context window size is not exposed in this Paperclip 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/shared/src/index.ts

@@ -45,6 +45,9 @@ export {
   SYSTEM_ISSUE_DOCUMENT_KEYS,
   isSystemIssueDocumentKey,
   ISSUE_REFERENCE_SOURCE_KINDS,
+  DOCUMENT_ANNOTATION_THREAD_STATUSES,
+  DOCUMENT_ANNOTATION_ANCHOR_STATES,
+  DOCUMENT_ANNOTATION_ANCHOR_CONFIDENCES,
   ISSUE_EXECUTION_POLICY_MODES,
   ISSUE_EXECUTION_STAGE_TYPES,
   ISSUE_MONITOR_SCHEDULED_BY,
@@ -164,6 +167,9 @@ export {
   type IssueTreeHoldStatus,
   type SystemIssueDocumentKey,
   type IssueReferenceSourceKind,
+  type DocumentAnnotationThreadStatus,
+  type DocumentAnnotationAnchorState,
+  type DocumentAnnotationAnchorConfidence,
   type IssueExecutionPolicyMode,
   type IssueExecutionStageType,
   type IssueMonitorScheduledBy,
@@ -376,6 +382,20 @@ export type {
   IssueWorkProductProvider,
   IssueWorkProductStatus,
   IssueWorkProductReviewState,
+  CreateDocumentAnnotationCommentRequest,
+  CreateDocumentAnnotationThreadRequest,
+  DocumentAnnotationAnchorRemapSnapshot,
+  DocumentAnnotationAnchorSelector,
+  DocumentAnnotationAnchorSnapshot,
+  DocumentAnnotationComment,
+  DocumentAnnotationTextPositionSelector,
+  DocumentAnnotationTextQuoteSelector,
+  DocumentAnnotationThread,
+  DocumentAnnotationThreadWithComments,
+  DocumentTextPosition,
+  DocumentTextProjection,
+  DocumentTextRange,
+  UpdateDocumentAnnotationThreadRequest,
   Issue,
   IssueAssigneeAdapterOverrides,
   IssueBlockerAttention,
@@ -654,6 +674,22 @@ export {
   type IssueReferenceMatch,
 } from "./issue-references.js";
 
+export {
+  anchorSnapshotToSelector,
+  createDocumentAnchorSelector,
+  normalizeAnchorText,
+  projectMarkdownToText,
+  remapDocumentAnchor,
+  resolveProjectionRange,
+  selectorToAnchorSnapshot,
+  verifyDocumentAnchorSelector,
+  type CreateDocumentAnchorSelectorOptions,
+  type RemapDocumentAnchorInput,
+  type RemapDocumentAnchorResult,
+  type VerifyDocumentAnchorSelectorInput,
+  type VerifyDocumentAnchorSelectorResult,
+} from "./document-anchors.js";
+
 export {
   sidebarOrderPreferenceSchema,
   upsertSidebarOrderPreferenceSchema,
@@ -795,6 +831,18 @@ export {
   type CreateProjectWorkspace,
   type UpdateProjectWorkspace,
   projectExecutionWorkspacePolicySchema,
+  createDocumentAnnotationCommentSchema,
+  createDocumentAnnotationThreadSchema,
+  documentAnnotationAnchorConfidenceSchema,
+  documentAnnotationAnchorSelectorSchema,
+  documentAnnotationAnchorStateSchema,
+  documentAnnotationTextPositionSelectorSchema,
+  documentAnnotationTextQuoteSelectorSchema,
+  documentAnnotationThreadStatusSchema,
+  updateDocumentAnnotationThreadSchema,
+  type CreateDocumentAnnotationComment,
+  type CreateDocumentAnnotationThread,
+  type UpdateDocumentAnnotationThread,
   companySearchQuerySchema,
   COMPANY_SEARCH_DEFAULT_LIMIT,
   COMPANY_SEARCH_MAX_LIMIT,