Update MASTG-TECH-0142: add direct file system inspection of WebView storage directory

[Copilot]

MASTG-TECH-0142 only covered Chrome DevTools for WebView storage inspection. It now includes direct file system access to /data/data/<app_package>/app_webview/ and references @MASTG-KNOW-0018 for storage area context.

Changes

• MASTG-TECH-0142: Added "Direct File System Inspection" section with three approaches, delegating general file transfer to @MASTG-TECH-0002:

  • @MASTG-TOOL-0004 (adb): adb pull to retrieve the directory; adb shell grep to search in-place. Notes root/debuggable requirement.
  • @MASTG-TOOL-0007 (Android Studio): Device File Explorer UI path. Notes root/debuggable requirement.
  • @MASTG-TOOL-0038 (objection): filesystem download — works without root or debuggable app.
  • Added @MASTG-KNOW-0018 reference for expected directory contents.

• MASTG-TEST-0320 (step 6): Updated reference from @MASTG-TECH-0002 → @MASTG-TECH-0142.

• MASTG-DEMO-0082 (step 7): Updated reference from @MASTG-TECH-0002 → @MASTG-TECH-0142.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update and use MASTG-TECH-0142</issue_title>
<issue_description>Update MASTG-TECH-0142 to include direct inspection or retrieval of /data/data/<app_package>/app_webview/, e.g. via adb, objection or Android Studio

Ensure it's used in the relevant tests such as tests-beta/android/MASVS-PLATFORM/MASTG-TEST-0320.md

• Use @MASTG-TOOL-XXXX IDs everywhere.
• If another MASTG-TECH covers part of the steps here you should use it instead (e.g. for "Obtain a shell").
• Refer to MASTG-KNOW-0018 for "what to expect within this folder".</issue_description>

Comments on the Issue (you are @copilot in this section)

@cpholguera Thanks @SuyashJain17 . It's assigned to you now.

• Fixes Update and use MASTG-TECH-0142 #3602

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