chore(webapp): strip remaining phase labels from mollifier mutation route comments

Two Phase labels survived the earlier sweep — "Phase A6" in
api.v1.runs.\$runId.metadata.ts (the GET-loader-added comment, mirroring
the same pattern in api.v1.runs.\$runParam.attempts.ts on reads), and
"Phase B4" in api.v1.runs.\$runParam.replay.ts (referring to where
SyntheticRun was extended). Rewritten to plain prose; comment-only, no
behaviour change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: d-cs

apps/webapp/app/routes/api.v1.runs.$runId.metadata.ts

@@ -18,8 +18,8 @@ const ParamsSchema = z.object({
   runId: z.string(),
 });
 
-// Phase A6 — fixes the pre-existing route bug where GET on this URL
-// returned a Remix "no loader" 400. The route only exposed PUT (update);
+// GET handler added to fix the pre-existing route bug where this URL
+// returned a Remix "no loader" 400 — only PUT (update) was exported, so
 // GET had no handler. Returns `{ metadata, metadataType }` from either
 // the Postgres row or the mollifier buffer snapshot.
 export async function loader({ request, params }: LoaderFunctionArgs) {

apps/webapp/app/routes/api.v1.runs.$runParam.replay.ts

@@ -73,12 +73,11 @@ export async function action({ request, params }: ActionFunctionArgs) {
     });
 
     if (!taskRun) {
-      // Buffered fallback. The SyntheticRun shape was extended in
-      // Phase B4 to carry every field ReplayTaskRunService reads from a
-      // TaskRun. Validate the subset of fields the service consumes
-      // (BufferedReplayInputSchema above) before casting; a schema
-      // mismatch surfaces as a 404 here rather than as a silent
-      // undefined deep inside the service.
+      // Buffered fallback. SyntheticRun carries every field
+      // ReplayTaskRunService reads from a TaskRun. Validate the subset of
+      // fields the service consumes (BufferedReplayInputSchema above)
+      // before casting; a schema mismatch surfaces as a 404 here rather
+      // than as a silent undefined deep inside the service.
       const buffered = await findRunByIdWithMollifierFallback({
         runId: runParam,
         environmentId: env.id,