feat(vmcp): expose active backend sessions on /status endpoint

[yrobla]

Add session visibility to the /status endpoint for operational debugging and compliance auditing when sessionManagementV2 is enabled.

Closes: #3876

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

Adds session visibility to the vMCP /status endpoint to support operational debugging and compliance auditing when SessionManagementV2 is enabled.

Changes:

• Extend /status response schema to optionally include active vMCP sessions and backend session ID mappings.
• Add ListActiveSessions() to the session manager and expose the data through buildStatusResponse.
• Add unit tests for ListActiveSessions() behavior and a regression test that sessions is omitted when V2 is disabled.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
pkg/vmcp/server/status.go	Adds optional sessions block to /status when SessionManagementV2 is enabled.
pkg/vmcp/server/status_test.go	Updates status response test DTOs; adds tests for sessions omission and backend field redaction.
pkg/vmcp/server/sessionmanager/session_manager.go	Introduces SessionInfo and implements ListActiveSessions().
pkg/vmcp/server/sessionmanager/list_sessions_test.go	Adds tests for listing behavior across empty, placeholder-only, and populated stores.
pkg/vmcp/server/session_manager_interface.go	Extends the SessionManager interface with ListActiveSessions().

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[codecov]

Codecov Report

❌ Patch coverage is 93.47826% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.63%. Comparing base (e758073) to head (00098b1).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/vmcp/server/sessionmanager/session_manager.go	91.42%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4019      +/-   ##
==========================================
+ Coverage   68.60%   68.63%   +0.02%     
==========================================
  Files         444      444              
  Lines       45178    45223      +45     
==========================================
+ Hits        30995    31037      +42     
- Misses      11781    11783       +2     
- Partials     2402     2403       +1     

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