fix: prevent EnsurePath panic on non-ENOENT stat errors

[sozercan]

Motivation

• EnsurePath could dereference a nil FileInfo when os.Stat returned an error that was not ENOENT, which caused a panic for callers (e.g., ENOTDIR or permission errors).
• The intent is to treat non-ENOENT os.Stat errors as immediate failures while preserving the existing behavior of creating missing directories.

Description

• In pkg/utils/utils.go updated EnsurePath to immediately return non-ENOENT errors from os.Stat instead of dereferencing st, and to only call os.MkdirAll when the error is ENOENT.
• Kept the existing checks for st.IsDir() and permission bits when os.Stat succeeds.
• Added a regression test case StatErrorNotExist in pkg/utils/utils_test.go that exercises a non-ENOENT stat error path (e.g., path.Join(emptyFile, "child")) to ensure the function returns an error instead of panicking.

Testing

• Added unit test StatErrorNotExist in pkg/utils alongside existing TestEnsurePath tests and validated locally that the test exercises the non-ENOENT path (regression coverage added).
• Ran go test ./pkg/utils in this environment but the run failed due to module downloads from proxy.golang.org being forbidden, so tests could not complete here.

---

Codex Task

[Copilot]

Pull request overview

This PR fixes a crash in pkg/utils.EnsurePath by correctly handling os.Stat failures that are not ENOENT (e.g., ENOTDIR, permission errors), returning the Stat error instead of dereferencing a nil FileInfo. It also adds a regression test to ensure the non-ENOENT error path returns an error and does not panic.

Changes:

• Update EnsurePath to return immediately on non-os.IsNotExist errors from os.Stat.
• Restrict os.MkdirAll to the ENOENT case and return its result directly.
• Add a unit test case covering a non-ENOENT os.Stat error scenario (file/child => ENOTDIR-style error).

Show a summary per file

File	Description
pkg/utils/utils.go	Prevents EnsurePath panic by returning non-ENOENT os.Stat errors early and only creating directories on ENOENT.
pkg/utils/utils_test.go	Adds regression coverage to ensure the non-ENOENT stat error path returns an error (and would fail if a panic regressed).

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.18%. Comparing base (da17cae) to head (c704b4c).
⚠️ Report is 36 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1588      +/-   ##
==========================================
+ Coverage   38.80%   41.18%   +2.37%     
==========================================
  Files          57       58       +1     
  Lines        9561    10114     +553     
==========================================
+ Hits         3710     4165     +455     
- Misses       5581     5653      +72     
- Partials      270      296      +26     

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[omercnet]

Fix looks correct. The lint failure appears to be CI infrastructure, not this diff: golangci-lint config schema fetch timed out. Please rename StatErrorNotExist to StatErrorNonENOENT since path under a file exercises ENOTDIR.