perf(build-cli): speed up assert-tag validation

[Craig Macomber (Microsoft) (CraigMacomber)]

Description

Reduce local repository-wide assert-tag validation from approximately 44 seconds to 5.3 seconds, with identical validation output.

• Avoid loading external imports, standard library declarations, and ambient type packages while retaining local-import traversal.
• Cache module resolutions to avoid repeated filesystem lookups.
• Skip simulated tagging during validation unless --requireTagged is requested.
• Reject decoded messages containing */ before they can produce invalid block comments.
• Add isolated integration tests for validation, tagging, local imports, conditional import resolution, and no-write error handling.

Verified all 23 focused tests, TypeScript compilation, formatting, lint, and repository-wide validation using the locally built CLI.

Reviewer Guidance

The review process is outlined in the pull request guidelines.

The optimization assumes no additional package-local files are reachable only through external imports or ambient type packages. This limitation is documented alongside the project configuration.

[github-actions]

Hi! Thank you for opening this PR. Want me to review it?

Based on the diff (359 lines, 2 files), I've queued these reviewers:

• Correctness — logic errors, race conditions, lifecycle issues
• Security — vulnerabilities, secret exposure, injection
• API Compatibility — breaking changes, release tags, type design
• Performance — algorithmic regressions, memory leaks
• Testing — coverage gaps, hollow tests

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[github-actions]

Bundle size comparison

Base commit: could not be determined; will be reported when the comparison runs
Head commit: 698bc8cf77b25bb1b61ace0da0601275345e9614

Pending — Build - client packages is running. Results will appear here when the build completes.

[Copilot]

🔵 Needs a closer look

Validation and module-resolution changes warrant final human review.

Pull request overview

Speeds up generate:assertTags validation while preserving local import traversal and improving safety.

Changes:

• Optimizes TypeScript loading and module resolution.
• Skips unnecessary validation-time tagging.
• Rejects unsafe */ messages.
• Adds isolated integration coverage.

File summaries

File	Description
build-tools/packages/build-cli/src/test/commands/generate/assertTags.test.ts	Adds integration tests for tagging and validation scenarios.
build-tools/packages/build-cli/src/commands/generate/assertTags.ts	Implements validation performance optimizations and safety checks.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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