fix(hackbrowser): guard CYBERSTRIKE_VERSION in the worker's Copilot fetch — fixes Copilot crawls

The Copilot request path in the hackbrowser worker subprocess set its User-Agent with a bare
`CYBERSTRIKE_VERSION` — a build-time define that the standalone worker bundle build never
injects. In the subprocess that identifier is undefined, so the header line threw
`ReferenceError: CYBERSTRIKE_VERSION is not defined` on every planner LLM call, before the
fetch even ran; planPage then returned an empty plan for every page and the crawl "completed"
immediately with no exploration. Only surfaces when a GitHub Copilot model is used — other
providers never enter this branch.

Guard it exactly like Installation.VERSION already does (installation/index.ts):
`typeof CYBERSTRIKE_VERSION === "string" ? CYBERSTRIKE_VERSION : "local"`, so it falls back to
"local" instead of throwing. The main-process chat path uses this same guarded accessor, so the
worker now matches it. No token-exchange/header changes are needed: chat and worker both
authenticate with the raw token and equivalent headers, and chat works — aligning the
User-Agent is sufficient.

Verified: the bare reference throws ReferenceError; the guarded form returns "cyberstrike/local"
with no throw; cyberstrike typecheck clean.

Related: #107.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Serhatcck

packages/cyberstrike/src/hackbrowser-subprocess/hackbrowser-worker.ts

@@ -169,7 +169,12 @@ function createModelFromDescriptor(desc: ModelDescriptor): LanguageModel {
         headers.delete("authorization")
         headers.set("Authorization", `Bearer ${token}`)
         headers.set("x-initiator", "user")
-        headers.set("User-Agent", `cyberstrike/${CYBERSTRIKE_VERSION}`)
+        // CYBERSTRIKE_VERSION is a build-time define that the standalone worker bundle does not
+        // inject, so referencing it bare throws ReferenceError here (in the subprocess) and every
+        // planner call fails → the crawl "completes" with no plan. Guard it exactly like
+        // Installation.VERSION does (installation/index.ts) so it falls back to "local" instead.
+        const version = typeof CYBERSTRIKE_VERSION === "string" ? CYBERSTRIKE_VERSION : "local"
+        headers.set("User-Agent", `cyberstrike/${version}`)
         headers.set("Openai-Intent", "conversation-edits")
         return fetch(
           url,