Draft: integrate opt-in Tracebox v1 diagnostics

[adsamcik]

Tracebox v1 integration (draft)

Opt-in and privacy

• The tracebox flavor installs Tracebox at Application.attachBaseContext() in each app process, but starts disabled and only persists a successful user-selected profile.
• Tracker emits only one fixed, application-owned opt-in breadcrumb. It never passes Tracker location, Wi-Fi, cell, sensor, account, user-entered text, or Tracker identifiers to Tracebox.
• The standard flavor includes a no-op controller and no Tracebox runtime dependency.

Capture and export workflow

• Settings expose enable/disable, readiness/degraded state, deterministic Standard package preparation, exact digest preview, Tracebox-owned approval, Sharesheet, SAF save, cancellation, and deletion.
• Standard packages structurally exclude raw C2 crash artifacts. No raw-C2 export path is exposed.

Offline guarantee

• Tracebox is consumed as an immutable GitHub Packages version built from the pushed adsamcik/Tracebox foundation branch; Maven Local is not configured.
• Tracebox introduces no runtime network capability. Tracker's existing online features remain unchanged.

Validation status

• Draft intentionally opened before the requested new host and emulator validation phase.
• Post-draft validation, immutable package publication, static scans, and existing emulator-5554 flows are pending and will be added here with exact commands/results.

Current limitations

• This is a focused v1 integration PR. Certification is not claimed. Native Crashpad/ANR/exit paths require the post-draft qualification evidence and remain explicitly tracked as draft status.