feat(insights): compress.ts noise filter + per-session reprocess

Drop successful (2xx/3xx) asset and telemetry GETs from the semantic
timeline — these were eating MAX_LINES (80) before any user-behavior
signal could surface. In a 9m32s session we observed only the first
1:18 reached the LLM input because PostHog /collect/* pings filled
the budget. Failures (4xx/5xx) are still emitted as signal.

Filtered prefixes: /collect/, /flags, /array/, /static/, /assets/,
/api/surveys, /css2. Also raise MAX_LINES 80→120.

Add optional { sessionId } to POST /api/insights/reprocess so a single
session can be re-run end-to-end without resetting a whole batch.

apps/worker/src/lib/compress.ts

@@ -32,7 +32,26 @@ type SessionHeader = {
   companyContext?: string | null;
 };
 
-const MAX_LINES = 80;
+const MAX_LINES = 120;
+
+// Asset and telemetry GETs that successful (2xx/3xx) don't carry user-behavior
+// signal. We still emit them when they fail (4xx/5xx) — those indicate real
+// problems. Dropping these reclaims MAX_LINES budget for clicks, inputs, custom
+// events, and API failures that actually explain the session.
+function isNoiseUrl(pathname: string): boolean {
+  return (
+    pathname.startsWith("/collect/") ||
+    pathname.startsWith("/flags") ||
+    pathname.startsWith("/array/") ||
+    pathname.startsWith("/static/") ||
+    pathname.startsWith("/assets/") ||
+    pathname.startsWith("/api/surveys") ||
+    pathname === "/css2" ||
+    pathname.startsWith("/css2/") ||
+    pathname.endsWith(".js.map") ||
+    pathname.endsWith(".css.map")
+  );
+}
 
 export function compressSnapshots(
   events: RREvent[],
@@ -138,6 +157,8 @@ export function compressSnapshots(
         const method = r.method ?? "GET";
         const rurl = stripQuery(String(r.name ?? r.url ?? "/"));
         if (typeof status === "number") {
+          // Skip successful asset/telemetry GETs — keep failures (signal).
+          if (status < 400 && isNoiseUrl(rurl)) continue;
           const tag = status >= 500 ? "❌" : status >= 400 ? "⚠" : "→";
           lines.push(`${ts} → net ${method} ${rurl} ${tag} ${status}`);
           if (status >= 500) {