fix(electron): support packaged app.asar pages and rewritten unpacked companions (#1400)

* fix(electron): resolve pages served from inside app.asar

Packaged Electron applications load their renderer pages from file URLs
inside app.asar. The host filesystem cannot stat those paths, so
list_electron_targets excluded every such page as unsupported_url and
inspect_electron_page could not select it.

Resolve these URLs the way Electron's file protocol does: the first .asar
path component that is a regular file is the archive, and the remainder
must name a regular file in its header. Directories, links, and missing
members stay rejected. Parsed headers are cached by archive identity.

* fix(artifacts): extract and explain rewritten ASAR unpacked companions

Packaging tools commonly sign or strip .asar.unpacked native binaries after
writing the archive header, so their declared hashes no longer match.
analyze_javascript_application already accepts integrity_policy, but
extract_artifact did not, and inspect_artifact and extract_artifact still
told callers to "get a fresh copy", which cannot help for a shipped app.

- Accept integrity_policy on extract_artifact (MCP and CLI). The default
  still fails closed; record-and-continue writes the observed bytes and
  returns the extracted files' integrity_contradictions records.
- Name the unpacked entry and the post-packaging cause in integrity
  failures, and point every operation that accepts integrity_policy at
  record-and-continue.
- Report an active unpacked entry whose companion file is absent as
  unavailable with its logical path instead of a format failure.
- Share one integrity_policy schema across the inventory, extraction, and
  JavaScript application inputs.

* fix(electron): bound ASAR headers before allocation

---------

Co-authored-by: morluto <76467478+morluto@users.noreply.github.com>

src/application/javascript/JavaScriptArtifactReconstructionInput.ts

@@ -1,10 +1,11 @@
 import { z } from "zod";
+import { artifactIntegrityPolicySchema } from "../../domain/artifactIntegrityPolicy.js";
 
 /** Local ASAR/directory reconstruction request. */
 export const javascriptArtifactReconstructionInputSchema = z.strictObject({
   input_path: z.string().min(1),
   format: z.enum(["auto", "asar", "directory"]).default("auto"),
-  integrity_policy: z.enum(["fail", "record-and-continue"]).default("fail"),
+  integrity_policy: artifactIntegrityPolicySchema,
 });
 
 /** Parsed local reconstruction request. */