test: validate Android setup guide with real device

[prodnull]

Context

The Android setup guide documents how to configure HTTP Shortcuts to capture URLs from the share sheet. The iOS Shortcut flow has been validated end-to-end on a real device, but the Android guide has not been tested on hardware.

What needs testing

• HTTP Shortcuts app installs and configures as documented
• Share sheet trigger works from Chrome and other apps
• {url} variable correctly populates from share intent
• Bearer token auth works as expected
• Success toast displays after capture
• Retry-on-failure behavior works when the service is unreachable
• Tasker alternative (if anyone uses it) works as documented

How to test

1. Set up llmwiki-capture on a machine reachable from your phone (Tailscale recommended)
2. Follow the Android setup guide step by step
3. Share a URL from any app and verify the inbox file appears

Notes

The API contract itself is well-tested (16 unit tests covering auth, validation, dedup, rate limiting, sanitization). This is specifically about validating that the HTTP Shortcuts configuration instructions are correct and complete.

If you hit any issues, please comment with:

• Android version
• HTTP Shortcuts version
• What step failed and what you saw