fix(parser): support host namespaces inside nested security contexts with validation precedence

[i-OmSharma]

📝 Summary of Changes

This PR addresses the false-negative parser issue where nested host namespace configurations (hostNetwork, hostPID, hostIPC) under security boundaries like podSecurityContext were being silently ignored.

1. Nested Context Extraction (pkg/parser/helm.go):
   • Enhanced applySecFields to scan and unpack nested scalar keys for all three host namespace flags.
   • Incorporated precise nil-guards (if out.HostNetwork == nil) to preserve standard Kubernetes priority semantics—ensuring workload-level explicit declarations safely override nested maps.
2. Comprehensive Test Multi-Matrix (pkg/parser/helm_test.go):
   • Added host-namespace-flags-nested-under-podSecurityContext case to verify that nested flags are no longer dropped and evaluate cleanly to true.
   • Added workload-level-host-flags-take-precedence case to lock in structural fallback rules.

Closes #39

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🧪 Testing Details

• Verified locally by executing the internal test suite: go test -v -race -count=1 ./pkg/parser/...
• All 10 Go framework packages and race detectors pass with 100% success.

[github-actions]

First PR — welcome aboard!

A few things to expect:

1. CI: every PR runs build + race tests + lint on Ubuntu and macOS. If something fails, the log will tell you exactly which gate.
2. DCO: every commit needs Signed-off-by:. git commit -s adds it automatically.
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If you get stuck, reply here or jump to Discussions. We want this PR to land.

[i-OmSharma]

Hi @btwshivam,

I have opened this PR to resolve the nested host namespace parsing issue cleanly. All automated CI pipelines, linter workflows, and cross-platform tests (macOS/Ubuntu) have passed successfully with 100% green status!

🔍 Quick Architectural Summary:

1. Precision Extraction (pkg/parser/helm.go): Updated applySecFields to safely iterate and parse nested configurations (hostNetwork, hostPID, hostIPC) inside boundaries like podSecurityContext.
2. Precedence Protection: Enforced rigid nil-guards (if out.HostNetwork == nil) so that explicit workload-level security settings always maintain top-level priority over nested blocks, keeping behaviors predictable.
3. Double-Edge Test Coverage (pkg/parser/helm_test.go): Injected two core table-driven test cases validating both the clean extraction of nested flags and the correct fallback precedence execution.

The diff is completely atomic (+78 lines) and contains 0 merge conflicts against main. Ready for your review and merge! 🚀