provider actions - fwtypes.StringType

[srlynch1]

Guidance below is creating agent confusion/conflicts, either should be removed or clarified

https://github.com/hashicorp/agent-skills/blob/main/terraform/provider-development/skills/provider-actions/SKILL.md#common-schema-issues

Pay special attention to the schema definition - common issues after a first draft:

Type Mismatches

Using types.String instead of fwtypes.String in model structs
Using types.StringType instead of fwtypes.StringType in schema
Mixing framework types with plugin-framework types

[AdamTylerLynch]

PR #80 fixes this: the guidance was inverted — fwtypes is terraform-provider-aws's internal type package, so recommending it over terraform-plugin-framework/types is backwards everywhere outside that repo. The PR rewrites the section to recommend the plain framework types and notes repo-specific type layers (like AWS's fwtypes) as a convention to follow only when the target repo uses one. The PR body links back here so merging closes this issue.