pre-commit: check-json fails — duplicate key `iot` in aws4-shapes.json

[scottschreckengaust]

Part of #213.

Problem

check-json fails to decode a tracked JSON file because of a duplicate key:

plugins/deploy-on-aws/scripts/lib/aws4-shapes.json: Failed to json decode (Duplicate key: iot)

Duplicate keys are valid to most lenient parsers (last one wins) but are rejected by the strict check-json hook and are a latent correctness bug — whichever iot block is shadowed is silently ignored.

Reproduce

mise exec -- pre-commit run check-json --all-files

Proposed fix

Inspect the two iot entries in aws4-shapes.json, merge/deduplicate them (keeping the intended definition), and confirm the file still decodes. If the file is generated, fix the generator so it does not emit duplicate keys.

_{Filed with assistance from Claude Code while implementing #211.}