Adversarial-review finding: `create_group_script` validated every source
with `validate()` regardless of kind, so an imperatively-created group
module (`pic scripts deploy --group g --name kv --kind module`) skipped the
two gates every other module-write path enforces (app create/update in
api.rs, declarative apply in apply_service): the stricter `validate_module`
shape check and the `RESERVED_MODULE_NAMES` guard. A malformed-shape group
module was accepted at create (only failing later at import-resolve time)
and a reserved name (`kv`, `log`, …) slipped through.
Branch on kind to mirror the app path. Adds a journey asserting a reserved
group-module name is rejected.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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