[codex] harden authenticated routes and issue editor reliability (#3741)

## Thinking Path

> - Paperclip orchestrates AI agents for zero-human companies
> - The control plane depends on authenticated routes enforcing company
boundaries and role permissions correctly
> - This branch also touches the issue detail and markdown editing flows
operators use while handling advisory and triage work
> - Partial issue cache seeds and fragile rich-editor parsing could
leave important issue content missing or blank at the moment an operator
needed it
> - Blocked issues becoming actionable again should wake their assignee
automatically instead of silently staying idle
> - This pull request rebases the advisory follow-up branch onto current
`master`, hardens authenticated route authorization, and carries the
issue-detail/editor reliability fixes forward with regression tests
> - The benefit is tighter authz on sensitive routes plus more reliable
issue/advisory editing and wakeup behavior on top of the latest base

## What Changed

- Hardened authenticated route authorization across agent, activity,
approval, access, project, plugin, health, execution-workspace,
portability, and related server paths, with new cross-tenant and
runtime-authz regression coverage.
- Switched issue detail queries from `initialData` to placeholder-based
hydration so list/quicklook seeds still refetch full issue bodies.
- Normalized advisory-style HTML images before mounting the markdown
editor and strengthened fallback behavior when the rich editor silently
fails or rejects the content.
- Woke assigned agents when blocked issues move back to `todo`, with
route coverage for reopen and unblock transitions.
- Rebasing note: this branch now sits cleanly on top of the latest
`master` tip used for the PR base.

## Verification

- `pnpm exec vitest run ui/src/lib/issueDetailQuery.test.tsx
ui/src/components/MarkdownEditor.test.tsx
server/src/__tests__/issue-comment-reopen-routes.test.ts
server/src/__tests__/activity-routes.test.ts
server/src/__tests__/agent-cross-tenant-authz-routes.test.ts`
- Confirmed `pnpm-lock.yaml` is not part of the PR diff.
- Rebased the branch onto current `public-gh/master` before publishing.

## Risks

- Broad authz tightening may expose existing flows that were relying on
permissive board or agent access and now need explicit grants.
- Markdown editor fallback changes could affect focus or rendering in
edge-case content that mixes HTML-like advisory markup with normal
markdown.
- This verification was intentionally scoped to touched regressions and
did not run the full repository suite.

## Model Used

- OpenAI Codex, GPT-5-based coding agent in the Codex CLI environment
with tool use for terminal, git, and GitHub operations. The exact
runtime model identifier is not exposed inside this session.

## 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 run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] If this change affects the UI, it is behavior-only and does not
need before/after screenshots
- [x] I have updated relevant documentation to reflect my changes, or no
documentation changes were needed for these internal fixes
- [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>

server/src/routes/authz.ts

@@ -1,6 +1,12 @@
 import type { Request } from "express";
 import { forbidden, unauthorized } from "../errors.js";
 
+export function assertAuthenticated(req: Request) {
+  if (req.actor.type === "none") {
+    throw unauthorized();
+  }
+}
+
 export function assertBoard(req: Request) {
   if (req.actor.type !== "board") {
     throw forbidden("Board access required");
@@ -16,9 +22,7 @@ export function assertInstanceAdmin(req: Request) {
 }
 
 export function assertCompanyAccess(req: Request, companyId: string) {
-  if (req.actor.type === "none") {
-    throw unauthorized();
-  }
+  assertAuthenticated(req);
   if (req.actor.type === "agent" && req.actor.companyId !== companyId) {
     throw forbidden("Agent key cannot access another company");
   }
@@ -31,9 +35,7 @@ export function assertCompanyAccess(req: Request, companyId: string) {
 }
 
 export function getActorInfo(req: Request) {
-  if (req.actor.type === "none") {
-    throw unauthorized();
-  }
+  assertAuthenticated(req);
   if (req.actor.type === "agent") {
     return {
       actorType: "agent" as const,