[mig-builds]

Fixes #25282

Clarifies that terminal indexes are refused by has(), while intermediate numeric segments remain unguarded because the guard builder emits named field selections only.

Validation:

• pnpm --filter @objectstack/spec build
• pnpm --filter @objectstack/spec check:generated
• pnpm --filter @objectstack/spec test -- flow-value-slot-template.test.ts

[objectstack-fleet]

Thank you, @mig-builds, for this fix and for the clear validation steps.

Both this PR and #25367 state the post-#25275 has() rule correctly. The maintainer chose to land #25367 (ruling 6358845679 on #25282, letter A), because it also gives the exact reason such a path gets no guard: a step-at-a-time guard would end one has() on the index, and has() refuses an index as its last step. This repository lands contributions through an internal branch (card-first), so I'm closing this one in favour of #25367. Its landing commit carries Co-authored-by: mig-builds <54319294+mig-builds@users.noreply.github.com> to credit your work.

Thanks again. Contributions like this are very welcome.

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