Remove SessionCacheSize from ScalingConfig

[yrobla]

Summary

The local LRU session cache layer was dropped in favour of going directly to Redis for session storage, making SessionCacheSize meaningless. Remove the field from ScalingConfig, clean up its tests, and update the generated Swagger docs.

Type of change

• Bug fix
• New feature
• Refactoring (no behavior change)
• Dependency update
• Documentation
• Other (describe):

Test plan

• Unit tests (task test)
• E2E tests (task test-e2e)
• Linting (task lint-fix)
• Manual testing (describe below)

Changes

File	Change

Does this introduce a user-facing change?

Special notes for reviewers

[Copilot]

Pull request overview

Removes the now-obsolete SessionCacheSize knob from ScalingConfig after the local LRU session cache was removed in favor of Redis-backed session storage, and updates tests + generated Swagger artifacts accordingly.

Changes:

• Remove SessionCacheSize from pkg/runner’s ScalingConfig.
• Update run config serialization tests to only cover backend_replicas behavior.
• Regenerate/update Swagger docs to drop session_cache_size from the API schema.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/runner/config.go	Removes SessionCacheSize from ScalingConfig.
pkg/runner/config_test.go	Updates round-trip JSON/YAML tests to stop asserting session_cache_size.
docs/server/swagger.yaml	Removes session_cache_size from the OpenAPI schema.
docs/server/swagger.json	Removes session_cache_size from the OpenAPI schema JSON output.
docs/server/docs.go	Updates the embedded OpenAPI JSON template to remove session_cache_size.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.76%. Comparing base (ccb98c3) to head (d0363c9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4347      +/-   ##
==========================================
- Coverage   68.95%   68.76%   -0.20%     
==========================================
  Files         479      479              
  Lines       48489    48506      +17     
==========================================
- Hits        33438    33356      -82     
- Misses      12317    12344      +27     
- Partials     2734     2806      +72     

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

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