fix: remove forward export ownership policy

[artiphishle]

Summary

• remove the organization-wide ankhorage/no-forward-exports ESLint rule;
• remove the package-entrypoint resolver that existed only to support that rule;
• remove its integration-test coverage while keeping export sorting and the rest of the shared ESLint policy intact;
• add a patch changeset.

Rationale

Forward-export/module-ownership constraints are too repository- and architecture-specific to enforce globally from Devtools. Devtools should own broadly applicable tooling policy, not dictate package-internal export topology.

Validation

CI should cover build, doctor, lint, format, Knip, tests, typecheck, and changeset status.