fix(sourcemap): inject missing runtime snippets for existing debug IDs

[betegon]

Summary

Angular 22.1 emits debug IDs in JavaScript comments and source maps without Sentry's runtime registration snippet. The CLI treated those IDs as proof of completed injection, leaving the bundle unable to register its ID at runtime.

Preserve the existing ID and inject the missing snippet, adjusting source map mappings once. Apply the same decision to external and inline maps, automatic injection during upload, and dry-run reporting. Already registered bundles, including legacy CLI snippets, remain byte-identical; binary bundles with existing IDs and metadata-only build injection retain their existing behavior.

Fixes #1629.

Test plan

• 157 tests passed across nine related sourcemap, build-injection, and binary-detection test files. The new missing-registration cases fail against the original implementation.
• Built the Angular reproduction from the issue and ran the CLI: the original implementation reported zero modified files and no runtime snippet; the fix adds one snippet with the same UUID and shifts mappings once. A second run leaves both files byte-identical.
• Lint, typecheck, docs fragment checks, and git diff --check passed. Generated docs and SDK prerequisites produced no tracked generated changes.
• Not run: live upload, browser event ingestion, native binary build, or the full unit suite.

[vercel]

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Project	Deployment	Actions	Updated
cli	Ready	Preview	Sep 23, 2026 6:30pm UTC

1 Skipped Deployment

Project	Deployment	Actions	Updated
sentry-local	Skipped		Sep 23, 2026 6:30pm UTC