fix(generator): normalize error message consistency across generator surfaces

[jbeloved700]

Summary

Aligns generator validation and generation error messages to use consistent, actionable wording: sentence case, ending with a period, and no raw user input reflected verbatim when sensitive.

What was implemented

Three targeted changes across the generator surface:

src/generator/validation.ts

• Added missing trailing period to the destination "not a directory" message so all destination error messages end consistently with .
• Before: Destination already exists and is not a directory: ${destination}
• After: Destination already exists and is not a directory: ${destination}.

src/generator/template-registry.ts

• Removed raw user-provided templateId from the rejection message to avoid reflecting unsafe input verbatim
• Before: Unknown template '${templateId}'. Supported templates: ...
• After: The requested template is not supported. Supported templates: ...
• All test assertions that check for the Supported templates substring continue to pass

src/generator/template-sources.ts

• Removed template ID from the unavailable-bundle message
• Before: Template '${templateId}' is registered but is not bundled in this CLI version yet.
• After: The selected template is not available in this CLI version.

Acceptance criteria verified

• Path, collision, and substitution failures use consistent actionable wording ✅
• Unsafe input is not reflected verbatim when sensitive ✅
• Exit semantics (ValidationCliError → exit code 2) remain stable and unchanged ✅
• All existing test substring assertions continue to match ✅

Closes #140

[coderabbitai]

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