[repo-assist] test: Add unit tests for BookToolQueryService

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🤖 This PR was created by Repo Assist, an automated AI assistant.

Summary

BookToolQueryService backs several MCP tools used by the AI chat integration (GetChapterList, GetChapterSections, GetDirectContentUrl, GetNavigationContext, GetChapterSummary) but had no direct unit test coverage. This PR adds a focused test suite covering the service's public API.

Changes

• Added EssentialCSharp.Web.Tests/BookToolQueryServiceTests.cs with 12 tests using Moq (matching the existing repo convention for services with mockable dependencies), covering:
  • Table-of-contents mapping and URL construction in GetChapterList
  • Section ordering and McpException on unknown chapter in GetChapterSections
  • Blank/unknown section key and success paths in GetDirectContentUrl
  • Previous/next/parent resolution in GetNavigationContext
  • Chapter-scoped guideline filtering and unknown-chapter handling in GetChapterSummary

No production code was changed.

Test Status

• dotnet build EssentialCSharp.Web.Tests --configuration Release — ✅ succeeded, 0 warnings/errors
• dotnet test EssentialCSharp.Web.Tests --configuration Release --no-build — 159/161 passed. The 2 pre-existing failures (CaptchaService_Verify_Success, KnownBreachedPassword_IsDetected) are unrelated integration tests that call external network services (hCaptcha, HaveIBeenPwned) unreachable from this sandboxed environment; they fail identically on main without this change.
• dotnet format EssentialCSharp.Web.Tests --verify-no-changes — no issues reported for the new file (pre-existing formatting/naming findings in other files are unrelated to this change).

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Warning

Firewall blocked 2 domains

The following domains were blocked by the firewall during workflow execution:

• api.hcaptcha.com
• api.pwnedpasswords.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "api.hcaptcha.com"
    - "api.pwnedpasswords.com"

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[BenjaminMichaelis]

/repo-assist make sure the tests are DRY and using latest and best TUnit syntax and we should be using ! unecessarily like we are now

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