[GaTTGeng]

What does this PR do?

• Adds structured diagnostics for unknown, parsed-only, and partially applied configuration fields.
• Normalizes scalar health checks to CMD-SHELL, reports unapplied build options and extra network attachments, and validates all direct Engine operations in strict mode.
• Preserves overlay source provenance for escaped keys and ignores default-only resource definitions.
• Verifies integration-test teardown removes networks carrying each test project's ownership label.
• Reports multiple build platforms and duplicate target-port mappings before Engine operations, and treats service platform as a build fallback where applicable.
• Diagnoses long-form service volumes and unretained build keys, avoids warnings for default zero resource values and dependency conditions that match readiness behavior, and attributes merged-map diagnostics to the contributing overlay.

Why is this change needed?

Configurations that parse successfully can still behave differently when fields are only partly applied. The diagnostics and strict checks make these gaps visible before Engine operations, while the teardown assertion catches project network leaks that can exhaust a local daemon's address pool.

How was this tested?

• dotnet restore — passed.
• dotnet build --configuration Release --no-restore — passed with 0 warnings.
• Unit tests — passed on net8.0, net9.0, and net10.0 (275 each).
• dotnet pack --configuration Release --no-build --no-restore --output artifacts/packages — passed.
• Package README verification — passed for all 8 packages.
• Rider InspectCode on changed C# files — 0 suggestion-level findings.
• Full solution tests were run previously. Unit tests passed; Docker integration tests failed during network creation because the local daemon reported all predefined address pools have been fully subnetted. Integration test teardown now checks for remaining networks by the test project's label.

Checklist

• Code follows the repository style.
• Tests were added or updated for the behavior change.
• Documentation was updated where needed.
• CHANGELOG.md was updated.
• No unrelated generated files, IDE metadata, packages, or secrets are included.
• Build passed for the supported target frameworks.
• Full solution test run passes. Docker integration tests are blocked by the daemon address-pool exhaustion described above; the full unit suite passes for all three target frameworks.

Issue #65 lists #22 and #23 as prerequisites; both remain open and should be resolved before merge.

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[chatgpt-codex-connector]

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[GaTTGeng]

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