PM-35112: feat: Add underlying FedRAMP environment

[david-livefront]

🎟️ Tracking

PM-35112

📔 Objective

This PR adds the FedRAMP environment to the underlying structures of the app and integrates it into the LandingScreen UI.

The UI changes are currently feature flagged.

📸 Screenshots

Screen_recording_20260702_145555.mp4

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

Reviewed the addition of the FedRAMP environment across the data models (Environment, EnvironmentRegion, EnvironmentUrlDataJson) and its feature-flagged integration into the landing screen. All when branches on the Environment sealed class and EnvironmentRegion/Environment.Type enums are exhaustively handled (compiler-enforced), account creation is correctly disabled for FedRAMP, and each new branch has matching unit test coverage. No security, correctness, or breaking-change issues were found.

Code Review Details

No blocking findings.

Notes:

• The existing unresolved thread on EnvironmentUrlDataJson.kt:113 references a KDoc copy-paste error ("US region"). The current code reads "Default [EnvironmentUrlDataJson] for the FedRAMP environment." which is correct, so no further action is needed.
• FedRAMP is gated by FlagKey.FedRamp in LandingState.environmentTypeOptions but filtered unconditionally in StartRegistrationState — this is consistent with account creation being unsupported on FedRAMP.

[codecov]

Codecov Report

❌ Patch coverage is 85.18519% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.17%. Comparing base (3ece24b) to head (b513bcb).

Files with missing lines	Patch %	Lines
...epository/util/EnvironmentUrlDataJsonExtensions.kt	25.00%	6 Missing ⚠️
...i/auth/feature/environment/EnvironmentViewModel.kt	0.00%	0 Missing and 1 partial ⚠️
...warden/ui/auth/feature/landing/LandingViewModel.kt	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7138      +/-   ##
==========================================
+ Coverage   85.60%   86.17%   +0.57%     
==========================================
  Files         910      882      -28     
  Lines       65397    64392    -1005     
  Branches     9592     9588       -4     
==========================================
- Hits        55986    55493     -493     
+ Misses       5967     5456     -511     
+ Partials     3444     3443       -1     

Flag	Coverage Δ
app-data	17.60% <7.40%> (+0.29%)	⬆️
app-ui-auth-tools	18.80% <74.07%> (+0.17%)	⬆️
app-ui-platform	16.48% <1.85%> (-0.33%)	⬇️
app-ui-vault	27.50% <0.00%> (-0.02%)	⬇️
authenticator	6.16% <0.00%> (+<0.01%)	⬆️
lib-core-network-bridge	4.05% <0.00%> (-0.01%)	⬇️
lib-data-ui	1.14% <3.70%> (-0.01%)	⬇️

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