Add v4 catchRefailToTapError diagnostic

[mattiamanzati]

Adds the v4-only catchRefailToTapError suggestion for Effect.catch handlers that run an effect and then unconditionally re-fail the original error.

For example, this handler now suggests Effect.tapError:

save.pipe(
  Effect.catch(error => rollback.pipe(Effect.andThen(Effect.fail(error))))
)

// Suggested form:
save.pipe(Effect.tapError(() => rollback))

The diagnostic reads: “Use Effect.tapError to observe the error and preserve the original failure without having to re-fail it.”

Detection uses normalized piping flows and lazy-expression parsing. It accepts terminal Effect.andThen with a direct fail or zero-argument callback, and terminal Effect.flatMap with a zero-argument callback. The fail must reference the same unassigned handler parameter. Fixtures cover call forms, aliases, conditional recovery, changed errors, shadowing, reassignment, and work after the fail.

This initial implementation excludes generator handlers, selective catches, and v3. It provides a diagnostic without an automatic fix. Includes generated docs, configuration schemas, metadata, and a minor changeset.

Validation: pnpm setup-repo, pnpm lint, pnpm check, and pnpm test.

Closes #653 with the initial scope narrowed to the patterns above.