feat(struct-init-v2): resolve inline allocation argument projections

[karthikbhata97]

Parameter-sourced projections from inline struct allocations have no assertion-tree path, so their call-scoped result sites lose omitted or explicit field nilability. Resolve selector chains from allocation initializers so nil projections report without affecting non-nil inline arguments.

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[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.31%. Comparing base (6c75dfa) to head (24dfd5e).

Files with missing lines	Patch %	Lines
assertion/function/assertiontree/structinitv2.go	70.00%	11 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #504      +/-   ##
==========================================
- Coverage   90.42%   90.31%   -0.11%     
==========================================
  Files          82       82              
  Lines        9866     9916      +50     
==========================================
+ Hits         8921     8956      +35     
- Misses        701      712      +11     
- Partials      244      248       +4     

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[github-actions]

Golden Test

Note

✅ NilAway errors reported on standard libraries are identical.

2228 errors on base branch (main, 6c75dfa)
2228 errors on test branch (626e39c)