modfile,xgomod: support AutoLambdas

[xushiwei]

• Proposal: Auto Lambda xgo#2828

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.96%. Comparing base (9d3e55b) to head (f85904c).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #157       +/-   ##
===========================================
+ Coverage   55.89%   76.96%   +21.07%     
===========================================
  Files          13       11        -2     
  Lines        1222      890      -332     
===========================================
+ Hits          683      685        +2     
+ Misses        520      186      -334     
  Partials       19       19               

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[fennoai]

Review summary

This PR adds an AutoLambdas map[string]int field to Project, introduces ClassInfo (returning the auto-lambda map alongside isProj/ok), and deprecates ClassKind by delegating to it. The deprecation is idiomatic and backward-compatible, and build + go test ./xgomod/ ./modfile/ pass.

Main things to confirm before merge:

• AutoLambdas is never populated. No directive in parseVerb (modfile/rule.go) assigns it, so ClassInfo always returns a nil map today. This looks like a preparatory step for goplus/xgo#2828 — fine if population lands in a follow-up, but worth stating in the PR description so consumers don't assume the map is live yet.
• No test asserts the new autoLambdas return value. TestClassfile2 discards it with _ (xgomod/xgomod_test.go:153). Understandable while the field is unpopulated; once a directive fills it, add a fixture and assert the returned map contents.

Inline comments below cover the map-aliasing note and a stale test message. Performance review: no issues.

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