[codex] Respect manual workspace runtime controls (#4125)

## Thinking Path

> - Paperclip orchestrates AI agents inside execution and project
workspaces
> - Workspace runtime services can be controlled manually by operators
and reused by agent runs
> - Manual start/stop state was not preserved consistently across
workspace policies and routine launches
> - Routine launches also needed branch/workspace variables to default
from the selected workspace context
> - This pull request makes runtime policy state explicit, preserves
manual control, and auto-fills routine branch variables from workspace
data
> - The benefit is less surprising workspace service behavior and fewer
manual inputs when running workspace-scoped routines

## What Changed

- Added runtime-state handling for manual workspace control across
execution and project workspace validators, routes, and services.
- Updated heartbeat/runtime startup behavior so manually stopped
services are respected.
- Auto-filled routine workspace branch variables from available
workspace context.
- Added focused server and UI tests for workspace runtime and routine
variable behavior.
- Removed muted gray background styling from workspace pages and cards
for a cleaner workspace UI.

## Verification

- `pnpm install --frozen-lockfile --ignore-scripts`
- `pnpm exec vitest run server/src/__tests__/routines-service.test.ts
server/src/__tests__/workspace-runtime.test.ts
ui/src/components/RoutineRunVariablesDialog.test.tsx`
- Result: 55 tests passed, 21 skipped. The embedded Postgres routines
tests skipped on this host with the existing PGlite/Postgres init
warning; workspace-runtime and UI tests passed.

## Risks

- Medium risk: this touches runtime service start/stop policy and
heartbeat launch behavior.
- The focused tests cover manual runtime state, routine variables, and
workspace runtime reuse paths.

> 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 coding agent based on GPT-5, tool-enabled local shell and
GitHub workflow, exact runtime context window not exposed in 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 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, or documented why targeted component/service verification
is sufficient here
- [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>

ui/src/components/IssueWorkspaceCard.tsx

@@ -200,7 +200,7 @@ interface IssueWorkspaceCardProps {
   onUpdate: (data: Record<string, unknown>) => void;
   initialEditing?: boolean;
   livePreview?: boolean;
-  onDraftChange?: (data: Record<string, unknown>, meta: { canSave: boolean }) => void;
+  onDraftChange?: (data: Record<string, unknown>, meta: { canSave: boolean; workspaceBranchName?: string | null }) => void;
 }
 
 export function IssueWorkspaceCard({
@@ -298,6 +298,10 @@ export function IssueWorkspaceCard({
   });
 
   const canSaveWorkspaceConfig = draftSelection !== "reuse_existing" || draftExecutionWorkspaceId.length > 0;
+  const draftWorkspaceBranchName =
+    draftSelection === "reuse_existing" && configuredReusableWorkspace?.mode !== "shared_workspace"
+      ? configuredReusableWorkspace?.branchName ?? null
+      : null;
 
   const buildWorkspaceDraftUpdate = useCallback(() => ({
     executionWorkspacePreference: draftSelection,
@@ -316,8 +320,11 @@ export function IssueWorkspaceCard({
 
   useEffect(() => {
     if (!onDraftChange) return;
-    onDraftChange(buildWorkspaceDraftUpdate(), { canSave: canSaveWorkspaceConfig });
-  }, [buildWorkspaceDraftUpdate, canSaveWorkspaceConfig, onDraftChange]);
+    onDraftChange(buildWorkspaceDraftUpdate(), {
+      canSave: canSaveWorkspaceConfig,
+      workspaceBranchName: draftWorkspaceBranchName,
+    });
+  }, [buildWorkspaceDraftUpdate, canSaveWorkspaceConfig, draftWorkspaceBranchName, onDraftChange]);
 
   const handleSave = useCallback(() => {
     if (!canSaveWorkspaceConfig) return;