Reconcile CONTRIBUTING.md with actual package layout and direct dependency surface

[Copilot]

Nightly documentation reconciliation found two CONTRIBUTING.md drifts: it referenced a non-existent internal/jsonutil/ package and listed github.com/spf13/pflag as a direct dependency even though it is indirect via Cobra. This PR updates CONTRIBUTING.md to match the current implementation and contributor-facing dependency model.

• Project structure corrections

  • Removed internal/jsonutil/ from the internal/ tree diagram.
  • Removed internal/jsonutil/ from the Key Directories section.

• strutil ownership clarified

  • Updated internal/strutil/ descriptions (tree + Key Directories) to explicitly include JSON deep-clone utilities, aligning docs with strutil.DeepCloneJSON.

• Dependency list cleanup

  • Removed github.com/spf13/pflag from CONTRIBUTING.md direct dependencies.
  • Kept Cobra as the direct CLI framework dependency for flag registration guidance.

-    ├── jsonutil/              # JSON deep-clone utilities
-    ├── strutil/               # String and formatting utility helpers
+    ├── strutil/               # String, formatting, and JSON deep-clone utility helpers

- - **`internal/jsonutil/`** - JSON deep-clone utilities
- - **`internal/strutil/`** - String and formatting utility helpers (...)
+ - **`internal/strutil/`** - String, formatting, and JSON deep-clone utility helpers (...)

- - `github.com/spf13/pflag` - POSIX/GNU-style flag parsing used by tracing and CLI integrations

[Copilot]

Pull request overview

Updates contributor documentation to reflect the repository’s current internal package layout and the actual direct dependency surface, eliminating drift discovered by nightly reconciliation.

Changes:

• Removed the nonexistent internal/jsonutil/ package from the project structure diagram and “Key Directories” list.
• Clarified internal/strutil/ as the home for JSON deep-clone utilities (aligning with strutil.DeepCloneJSON).
• Removed github.com/spf13/pflag from the “Dependencies” section since it is an indirect dependency (via Cobra).

Show a summary per file

File	Description
CONTRIBUTING.md	Reconciles internal package structure and dependency documentation with the current codebase and go.mod direct/indirect dependency model.

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