[Repo Assist] Add SchemaReaderErrors property to OpenApiClientProvider (fixes #160) + CI tool caching

[github-actions]

🤖 This is a Repo Assist automated PR.

Summary

Addresses two separate improvements:

Task 3: SchemaReaderErrors property (fixes #160)

Adds a static SchemaReaderErrors : string list property to the root type generated by OpenApiClientProvider. This surfaces any OpenAPI parse errors at runtime, enabling users to see which validation issues were tolerated when IgnoreParseErrors=true.

type MyApi = OpenApiClientProvider<"schema.yaml", IgnoreParseErrors=true>

// Inspect which errors were silently tolerated
MyApi.SchemaReaderErrors |> List.iter printfn
// e.g. "Property 'nullable' is not allowed ... @ #/paths/..."

The property returns [] for valid schemas, so it's safe to always check.

Implementation details:

• Uses Expr.NewUnionCase to build the string list quotation at design time, embedding error message strings as literals in the generated assembly.
• Errors are formatted as "(message) @ (pointer)", matching the existing eprintfn output for IgnoreParseErrors=true.
• The property is added for both the valid-schema and error-schema code paths.

Tests added:

• Swagger.SchemaReaderErrors.Tests.fs: verifies SchemaReaderErrors = [] for a valid schema, and that the property is accessible for a schema with errors.
• schema-reader-errors-test.json: minimal schema with a parameter-level nullable (an OpenAPI 3.0 validation error).

Task 4: CI dotnet tools caching

Adds a cache step for ~/.dotnet/tools keyed on .config/dotnet-tools.json. This avoids re-downloading paket, fantomas, and dotnet-serve on each CI run.

Test Status

✅ SwaggerProvider.Tests: 204 passed, 0 failed (2 skipped - pre-existing)
⚠️ SwaggerProvider.ProviderTests: requires live Swashbuckle test server — not run locally (infrastructure dependency)
✅ Format check (dotnet fantomas --check): passed on changed files

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# Download the patch from the workflow run
gh run download 23154515974 -n agent-artifacts -D /tmp/agent-artifacts-23154515974

# Create a new branch
git checkout -b repo-assist/feat-schema-reader-errors-2026-03-16-710d5bf170ae380c master

# Apply the patch (--3way handles cross-repo patches)
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# Push the branch and create the pull request
git push origin repo-assist/feat-schema-reader-errors-2026-03-16-710d5bf170ae380c
gh pr create --title '[Repo Assist] Add SchemaReaderErrors property to OpenApiClientProvider (fixes #160) + CI tool caching' --base master --head repo-assist/feat-schema-reader-errors-2026-03-16-710d5bf170ae380c --repo fsprojects/SwaggerProvider

[sergey-tihon]

@co