provider-actions: generalize AWS-specific patterns and align test protocol

[AdamTylerLynch]

Surgical fixes to the provider-actions skill, including three factual errors:

1. Inverted type guidance. The skill instructed using fwtypes.String over
   types.String — but fwtypes is terraform-provider-aws's internal type
   package. Outside that repo the guidance is exactly backwards. Now recommends
   terraform-plugin-framework/types, noting repo-specific type layers as a
   convention to follow when present
2. Non-existent polling API. The wait.WaitForStatus/wait.Options example is
   not a public library. Replaced with a working ticker + context-deadline polling
   loop that reports progress via resp.SendProgress, with retry.StateChangeConf
   noted as the alternative
3. Inconsistent progress API. The Invoke example used resp.Progress.Set(ctx, …)
   while the requirements section documented resp.SendProgress(…). Standardized on
   SendProgress

Also: client from Configure (a.client) instead of AWS's a.Meta().Client(ctx);
test example aligned to ProtoV6ProviderFactories (consistent with
provider-test-patterns); progress events throttled to 30s while polling at 5s
(matching the interval the old example used); the sweeper code block replaced with a
delegation to provider-test-patterns, which owns the sweeper pattern;
regexp.MustCompile instead of AWS's regexache; .changelog/ and terrafmt
marked as provider-specific conventions to check in the target repo; version-bound
statements phrased "as of Terraform 1.14" so the skill ages gracefully.

Verification: scripts/validate-structure.sh passes; single-file diff.

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Fixes #40 — the inverted fwtypes guidance reported there is finding 1 above.