fix(core): omit undefined permission metadata

[S1LentH3arT]

Summary

• omit undefined fields when storing permission metadata
• preserve false, zero, and null metadata values

Tests

• bun turbo typecheck --concurrency=2
• bun test test/permission.test.ts (packages/core)

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The following comment was made by an LLM, it may be inaccurate:

Found related PRs that address similar issues:

Potential Duplicates:

1. PR fix(core): drop undefined metadata values from permission requests #46964 - fix(core): drop undefined metadata values from permission requests

   • fix(core): drop undefined metadata values from permission requests #46964
   • Very similar intent: dropping/omitting undefined permission metadata values

2. PR fix(core): drop undefined permission metadata values before publishing requests #46906 - fix(core): drop undefined permission metadata values before publishing requests

   • fix(core): drop undefined permission metadata values before publishing requests #46906
   • Directly related: also addresses undefined permission metadata values before publishing

These two earlier PRs appear to target the same issue. You should verify whether they were merged or closed, and if so, whether this PR (48443) addresses the same problem in a different way or if it's addressing a regression/oversight from those attempts.

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