Fix BL-15836 Allow Minimal Book constructor for ErrorBook

[hatton]

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[Copilot]

Pull request overview

This PR fixes an issue where ErrorBook could not be instantiated in production code due to a guard in the Book base class constructor that only allowed instantiation during unit tests.

Changes:

• Added a protected Book(bool allowNonTestCtor) constructor to allow specific subclasses to bypass the unit-test guard
• Modified ErrorBook to call base(true) to use the new constructor path
• Improved code comments for clarity and consistency

Reviewed changes

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

File	Description
src/BloomExe/Book/Book.cs	Added protected constructor with boolean parameter to allow subclasses to bypass unit-test guard; improved comment formatting
src/BloomExe/Book/ErrorBook.cs	Modified constructor to call base(true) to bypass guard; improved and cleaned up comments

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.

[StephenMcConnel]

@StephenMcConnel reviewed 2 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @hatton).