test: harden interpreter and observer generator coverage

[JerrettDavis]

Summary

• add Interpreter diagnostics for blank rule names and invalid terminal/non-terminal method shapes
• add Observer source-shape coverage for invalid enum configuration fallback defaults
• move Interpreter generator line coverage over 99%

Refs #413

Verification

• dotnet test test\PatternKit.Generators.Tests\PatternKit.Generators.Tests.csproj --configuration Release -p:TestTfmsInParallel=false --filter "FullyQualifiedNameObserverGeneratorTests|FullyQualifiedNameInterpreterGeneratorTests"
• dotnet test test\PatternKit.Generators.Tests\PatternKit.Generators.Tests.csproj --configuration Release -p:TestTfmsInParallel=false --collect:"XPlat Code Coverage" --results-directory TestResults-generators-current -- DataCollectionRunSettings.DataCollectors.DataCollector.Configuration.Format=cobertura
• PatternKit.Generators coverage: 97.98%
• InterpreterGenerator coverage: 99.39%

[github-actions]

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Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[Copilot]

Pull request overview

Adds targeted generator test coverage for the Interpreter and Observer source generators to push line coverage toward 99% (refs #413). The Interpreter test asserts PKINT003 is reported for each of six distinct invalid rule shapes (blank name, void return, generic method, missing parameters, wrong non-terminal first parameter, wrong context type), exercising every branch in TryGetRule. The Observer test asserts that out-of-range enum values for Threading, Exceptions, and Order silently fall back to the documented defaults (Locking / Continue / RegistrationOrder) by checking the generated source shape.

Changes:

• New Interpreter test covering all PKINT003 invalid-rule branches in a single compilation.
• New Observer test covering invalid-enum fallback behavior via generated-source assertions.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/PatternKit.Generators.Tests/InterpreterGeneratorTests.cs	Adds ReportsDiagnosticsForInvalidInterpreterRuleShapes asserting six PKINT003 diagnostics.
test/PatternKit.Generators.Tests/ObserverGeneratorTests.cs	Adds Invalid_Enum_Configuration_Falls_Back_To_Observer_Defaults verifying default Locking/Continue source shape.

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[github-actions]

Test Results

    12 files      12 suites   11m 57s ⏱️
 4 032 tests  4 032 ✅ 0 💤 0 ❌
12 527 runs  12 527 ✅ 0 💤 0 ❌

Results for commit c2a70f8.

[github-actions]

Code Coverage

Summary
  Generated on: 05/31/2026 - 16:09:59
  Coverage date: 05/31/2026 - 16:07:22 - 05/31/2026 - 16:09:47
  Parser: MultiReport (12x Cobertura)
  Assemblies: 5
  Classes: 1715
  Files: 579
  Line coverage: 97.2%
  Covered lines: 45908
  Uncovered lines: 1280
  Coverable lines: 47188
  Total lines: 100757
  Branch coverage: 84% (14520 of 17272)
  Covered branches: 14520
  Total branches: 17272
  Method coverage: 97.2% (8969 of 9225)
  Full method coverage: 91.4% (8440 of 9225)
  Covered methods: 8969
  Fully covered methods: 8440
  Total methods: 9225

PatternKit.Core                                                                                                       96%
  PatternKit.Application.ActivityTracking.ActivityGateState                                                          100%
  PatternKit.Application.ActivityTracking.ActivityLease                                                              100%
  PatternKit.Application.ActivityTracking.ActivityRecord                                                             100%
  PatternKit.Application.ActivityTracking.ActivityTracker                                                            100%
  PatternKit.Application.Aggregates.AggregateCommandHandler<T1, T2, T3>                                              100%
  PatternKit.Application.Aggregates.AggregateCommandResult<T>                                                        100%
  PatternKit.Application.Aggregates.AggregateRoot<T1, T2>                                                            100%
  PatternKit.Application.AntiCorruption.AntiCorruptionLayer<T1, T2>                                                 90.4%
  PatternKit.Application.AntiCorruption.AntiCorruptionResult<T>                                                      100%
  PatternKit.Application.AuditLog.AuditLogAppendResult<T>                                                           85.7%
  PatternKit.Application.AuditLog.InMemoryAuditLog<T1, T2>                                                          95.4%
  PatternKit.Application.BoundedContexts.BoundedContextAdapter                                                       100%
  PatternKit.Application.BoundedContexts.BoundedContextCapability                                                   83.3%
  PatternKit.Application.BoundedContexts.BoundedContextDescriptor                                                   95.4%
  PatternKit.Application.ContextMaps.ContextMapDescriptor                                                           96.8%
  PatternKit.Application.ContextMaps.ContextMapRelationship                                                          100%
  PatternKit.Application.DataMapping.DataMapper<T1, T2>                                                             94.6%
  PatternKit.Application.DataMapping.DataMapperError                                                                  90%
  PatternKit.Application.DataMapping.DataMapperResult<T>                                                            84.6%
  PatternKit.Application.DomainEvents.DomainEventDispatcher<T>                                                      95.4%
  PatternKit.Application.DomainEvents.DomainEventDispatchResult                                                      100%
  PatternKit.Application.DomainServices.DomainServiceOperation<T1, T2>                                               100%
  PatternKit.Application.DomainServices.DomainServiceRegistry<T1, T2>                                                100%
  PatternKit.Application.EventSourcing.EventStoreAppendResult                                                        100%
  PatternKit.Application.EventSourcing.InMemoryEventStore<T1, T2>                                                   97.9%
  PatternKit.Application.EventSourcing.StoredEvent<T1, T2>                                                            80%
  PatternKit.Application.EventualConsistency.EventualConsistencyEvaluation<T>                                       92.3%
  PatternKit.Application.EventualConsistency.EventualConsistencyMonitor<T>                                          97.2%
  PatternKit.Application.EventualConsistency.EventualConsistencyMonitorState<T>                                      100%
  PatternKit.Application.EventualConsistency.EventualConsistencyWatermarks<T>                                       96.7%
  PatternKit.Application.FeatureToggles.FeatureToggleDecision                                                       87.5%
  PatternKit.Application.FeatureToggles.FeatureToggleRule<T>                                                         100%
  PatternKit.Application.FeatureToggles.FeatureToggleSet<T>                                                         96.9%
  PatternKit.Application.IdentityMap.IdentityMap<T1, T2>                                                             100%
  PatternKit.Application.IdentityMap.IdentityMapResult<T>                                                           92.8%
  PatternKit.Application.ManualTaskGates.ManualTaskGate<T>                                                          98.5%
  PatternKit.Application.ManualTaskGates.ManualTaskGateState<T>                                                      100%
  PatternKit.Application.ManualTaskGates.ManualTaskRecord<T>                                                        96.9%

[github-actions]

🔍 PR Validation Results

Version: ``

✅ Validation Steps

• Build solution
• Run tests
• Build documentation
• Dry-run NuGet packaging

📊 Artifacts

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.38%. Comparing base (869f436) to head (c2a70f8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #478      +/-   ##
==========================================
+ Coverage   97.28%   97.38%   +0.10%     
==========================================
  Files         579      579              
  Lines       47188    47188              
  Branches     3076     6772    +3696     
==========================================
+ Hits        45906    45954      +48     
+ Misses       1282     1234      -48     

Flag	Coverage Δ
unittests	97.38% <ø> (+0.10%)	⬆️

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