Remove legacy locale and translation contracts

[efraespada]

The locale and translation interfaces now enforce the canonical contracts consistently. Legacy locale compatibility paths are removed, reducing ambiguity for callers and keeping localized output behavior predictable.

What changed

• Enforced strict validation and canonical handling for locale values.
• Removed legacy locale and translation contract paths and aliases.
• Aligned locale-dependent flows with the current repository, issue, and pull-request contracts.

Review notes

• This is a compatibility-cut change: integrations using removed legacy locale contracts must migrate to the canonical interfaces.
• No separate linked issue is resolved by this pull request.

[docs-page]

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docs.page/vypdev/copilot~392

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.02%. Comparing base (274db40) to head (2a9ef0a).
⚠️ Report is 791 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #392      +/-   ##
===========================================
+ Coverage    90.94%   93.02%   +2.08%     
===========================================
  Files          135      657     +522     
  Lines         6251    17541   +11290     
  Branches      1338     4509    +3171     
===========================================
+ Hits          5685    16318   +10633     
- Misses         172      473     +301     
- Partials       394      750     +356     

Files with missing lines	Coverage Δ
src/actions/github_action_completion.ts	94.26% <100.00%> (ø)
src/application/policies/agent_response_schemas.ts	100.00% <ø> (ø)
...tion/policies/bugbot_review_presentation_policy.ts	100.00% <100.00%> (ø)
...application/policies/comment_translation_policy.ts	100.00% <ø> (ø)
...plication/policies/setup_configuration_defaults.ts	97.67% <ø> (ø)
...plication/policies/setup_doctor_message_catalog.ts	100.00% <ø> (ø)
...application/policies/setup_doctor_report_policy.ts	100.00% <100.00%> (ø)
...ation/services/deployment_orchestration_runtime.ts	88.11% <100.00%> (ø)
src/application/usecases/issue_workflow_context.ts	100.00% <ø> (ø)
...lication/usecases/pull_request_workflow_context.ts	100.00% <ø> (ø)
... and 11 more

... and 698 files with indirect coverage changes

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[vypbot]

Bugbot: review incomplete

Current status: The review of 2a9ef0a has partial coverage and cannot declare the whole pull request clean.

Action: Inspect the omitted items or reduce the pull request scope. Rerun the review only after changing the scope, limits, or access.

Incomplete coverage

• selection: complete; retained=1
• pull-request-comments: complete; retained=0
• review-threads: complete; retained=0
• diff: partial; retained=49, omitted=24, truncated=1
• previous-findings: complete; retained=0
• human-conversation: complete; retained=0
• rules: complete; retained=0

Pull request · Verified commit · Workflow run