mcp: expose server version in healthcheck output

[cubaseuser123]

Changes

Was going through the mcp package exploring the codebase, and I noticed the healthcheck tool only returns { "status": "ok", "message": "..." }.

Agents currently have no way to know which version of knative-func is running the server. Maybe an outdated binary could run against a new cluster and behave differently, so an agent needs to have the version number to debug that.

mcp.go already defines a package-level version constant (used during handshake). This PR just takes that existing constant into the HealthcheckOutput so agents have immediate version context during healthchecks.

This PR:

• Adds a Version field to HealthcheckOutput and populates it.
• Adds the corresponding non-empty assertion to TestTool_Healthcheck.

/kind enhancement

There is no open issue for this; I found it during a codebase review. But I recently made another PR #3724.

I ran the test suite and everything runs ok for me locally. Let me know if any changes are required.

Release Note

[knative-prow]

Hi @cubaseuser123. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[matejvasek]

/ok-to-test

[matejvasek]

/approve
/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cubaseuser123, matejvasek

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.96%. Comparing base (e435a89) to head (8b7645a).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3745      +/-   ##
==========================================
+ Coverage   56.95%   56.96%   +0.01%     
==========================================
  Files         181      181              
  Lines       21116    21117       +1     
==========================================
+ Hits        12026    12030       +4     
+ Misses       7866     7863       -3     
  Partials     1224     1224              

Flag	Coverage Δ
e2e	35.79% <0.00%> (-0.03%)	⬇️
e2e go	32.42% <0.00%> (-0.01%)	⬇️
e2e node	28.20% <0.00%> (-0.01%)	⬇️
e2e python	32.80% <0.00%> (-0.01%)	⬇️
e2e quarkus	28.34% <0.00%> (-0.01%)	⬇️
e2e rust	27.75% <0.00%> (?)
e2e springboot	26.26% <0.00%> (-0.01%)	⬇️
e2e typescript	28.30% <0.00%> (-0.03%)	⬇️
e2e-config-ci	17.70% <0.00%> (-0.01%)	⬇️
integration	17.30% <0.00%> (-0.01%)	⬇️
unit macos-14	45.05% <100.00%> (+<0.01%)	⬆️
unit macos-latest	45.05% <100.00%> (+<0.01%)	⬆️
unit ubuntu-24.04-arm	45.32% <100.00%> (+<0.01%)	⬆️
unit ubuntu-latest	46.01% <100.00%> (+<0.01%)	⬆️
unit windows-latest	45.10% <100.00%> (+<0.01%)	⬆️

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[matejvasek]

Functions / Template Tests (macos-14) (pull_request) is a flake.