deps(nuget): update dependency snapshotassertions.tunit to 0.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
SnapshotAssertions.TUnit	0.3.0 → 0.4.0

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Release Notes

JohnVerheij/SnapshotAssertions.TUnit (SnapshotAssertions.TUnit)

v0.4.0

Additive release. No breaking changes; baselines that opted into Scrubbers.Default produce byte-identical output.

Added

• Scrubbers.GuidN: scrubs 32-character GUID-N format strings (the Guid.ToString("N") shape) into <guid:N> tokens. Shares the "guid" kind name with Scrubbers.Guid, so the index counter is unified across both formats; the Nth GUID occurrence in a snapshot gets the same N regardless of which format produced it.
• Scrubbers.ElapsedMs: scrubs elapsed-millisecond values (42ms, 42.5ms, 1234.567 ms) into <elapsed-ms:N> tokens. Case-sensitive on the ms suffix.
• Scrubbers.Common: curated chain of Guid + GuidN + Iso8601Timestamp + UnixEpochMillis + ElapsedMs. Superset of Scrubbers.Default; opt-in for the extended pattern set. Ordering follows the most-specific-first rule to avoid double-scrubbing.
• DiffSuggestionAnalyzer.Analyze(string diff): scans a snapshot-mismatch diff for known volatile patterns and returns DiffSuggestion entries recommending applicable built-in scrubbers, ordered by hit count descending with stable secondary ordering by declaration order. Counts matches only on lines that begin with + or -; context lines are skipped so patterns unchanged on both sides do not surface as suggestions.
• DiffSuggestion(string PatternName, int Count, string Recommendation) record: one scrubber recommendation surfaced by DiffSuggestionAnalyzer.
• SnapshotResult.Describe() / WriteDescription smart-diff suggestion section: on Mismatched outcomes with detected patterns, the failure message now includes a "Suggestion(s)" section between the diff and the accept-flow guidance. The list is capped at the top 3 patterns by hit count; surplus patterns roll up into an "... and N more" line pointing consumers at Scrubbers.Common. Failure messages for Mismatched outcomes with no detected patterns, and for all other outcomes (Matched, NoBaseline, Accepted), are byte-identical to v0.3.0.
• SnapshotAssertions.Render.SnapshotRenderer<T> abstract base class: consumers subclass to plug domain types (Google.Protobuf messages, XDocument, Activity, project-specific value objects) into the snapshot pipeline.
• SnapshotAssertions.Render.Renderer.For<T>(Func<T, string>) static factory: builds a renderer from a lambda when a full subclass is unnecessary.
• RenderedSnapshotAssertion<T>: renderer-projected assertion type returned by the two new MatchesSnapshot<T> overloads. Carries the same chain methods as SnapshotAssertion (WithName, AtPath, WithOptions, WithScrubber).
• MatchesSnapshot<T>(this IAssertionSource<T>, SnapshotRenderer<T>) extension: renderer-projected entry point taking a subclass renderer. Use when the renderer is reusable and owns configuration or state.
• MatchesSnapshot<T>(this IAssertionSource<T>, Func<T, string>) extension: delegate-shaped entry point. Use for inline projections and for composing with a sibling family package's static renderer method without taking a reference on its assembly.

Changed

• TUnit package reference bumped 1.44.0 → 1.44.39 (and the external-consumer smoke-test pin). 1.44.39 carries the [GenerateAssertion] source-generator fix for value-type optional parameters; no behavioural change for this package, taken for family lockstep.
• Microsoft.SourceLink.GitHub bumped 10.0.203 → 10.0.300. The embedded source-link metadata in shipped .pdb files now points at the updated SourceLink schema; debugging-into-the-package from consumers' IDEs is unaffected in behaviour but uses the newer SourceLink format.
• README cookbook documents Scrubbers.Common ordering rationale, smart-diff suggestion output shape and top-3 cap, the renderer-pattern API with four worked subclass examples (OtelTraceIdScrubber, EphemeralPathScrubber, PortScrubber, NumericTokenScrubber as a parameterised variant), and sibling-family composition without cross-package dependency.
• Packaged READMEs (src/SnapshotAssertions.TUnit/README.md, src/SnapshotAssertions/README.md) mention Scrubbers.Common, smart-diff suggestions, and the renderer-pattern API with deep-links to the root README.

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