changes from review

[yrobla]

Simplify code, remove tests and move related packages

Related-to: #3867

Large PR Justification

This is a code refactor, that means moving and deleting files, so that's the reason for the big diff

[github-actions]

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## Large PR Justification

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[Copilot]

Pull request overview

Refactors vMCP session token-binding / hijack-prevention code by moving the security implementation into an internal package and centralizing the “compute + persist metadata + wrap session” logic, while also simplifying/reshaping the associated tests and removing prior integration coverage.

Changes:

• Move token-binding security utilities + hijack-prevention decorator into pkg/vmcp/session/internal/security and introduce PreventSessionHijacking(...) as the single entry point.
• Update MultiSession factory to apply hijack-prevention via the new internal security helper and remove the old decorator/standalone security package.
• Reshuffle tests (unit tests moved/updated) and remove the previous server token-binding integration test; simplify v2 server integration fake factory setup.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
pkg/vmcp/session/token_binding_test.go	Updates tests to reference internal security metadata keys and changes validation strategy for defensive-copy behavior.
pkg/vmcp/session/security/security.go	Removes the previous (non-internal) security utilities package.
pkg/vmcp/session/internal/security/security.go	Adds internalized token-binding + hijack-prevention implementation (hashing, salt, decorator, wrapper function).
pkg/vmcp/session/internal/security/security_test.go	Updates security unit tests to use the new internal package location and adds tests for ShouldAllowAnonymous.
pkg/vmcp/session/internal/security/hijack_prevention_test.go	Adds focused tests for validateCaller edge cases, concurrency, and basic PreventSessionHijacking metadata behavior.
pkg/vmcp/session/hijack_prevention_decorator.go	Removes the previous session-level decorator implementation.
pkg/vmcp/session/factory.go	Switches factory to internal/security.PreventSessionHijacking(...) and removes in-factory token binding computation/metadata writes.
pkg/vmcp/server/token_binding_integration_test.go	Removes end-to-end HTTP integration tests that exercised token binding with Authorization headers.
pkg/vmcp/server/sessionmanager/session_manager.go	Replaces use of the removed helper with inline allowAnonymous logic.
pkg/vmcp/server/session_management_v2_integration_test.go	Removes fake token-hash metadata population logic from the v2 integration fakes.

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[codecov]

Codecov Report

❌ Patch coverage is 75.80645% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.60%. Comparing base (27e8d57) to head (8044a49).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/vmcp/session/internal/security/security.go	76.47%	21 Missing and 7 partials ⚠️
pkg/vmcp/session/factory.go	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4028      +/-   ##
==========================================
- Coverage   68.61%   68.60%   -0.02%     
==========================================
  Files         444      444              
  Lines       45178    45263      +85     
==========================================
+ Hits        31001    31054      +53     
- Misses      11777    11805      +28     
- Partials     2400     2404       +4     

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Large PR justification has been provided. Thank you!

[github-actions]

✅ Large PR justification has been provided. The size review has been dismissed and this PR can now proceed with normal review.

[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated no new comments.

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[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated 5 comments.

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