refactor: remove obsolete compatibility shims

[itsDNNS]

Summary

• remove an unused report-period compatibility delegate
• remove an unreferenced module-secret reservation adapter
• trim unreferenced legacy module-loader re-exports while preserving the live facade

Verification

• 238 passed focused Python tests
• 3860 passed, 2 skipped complete non-browser Python suite
• 9 passed JavaScript contract tests
• 69 locale catalogs validated against en.json
• 531 passed browser E2E cases across the canonical four shards
• maintenance budget: application Python −21 LOC, application functions −2, application tree −1,031 bytes; test and all other independent ledgers unchanged

Risk

Low. Every removed symbol had no in-repository or official community-module consumer, and the complete non-browser suite stayed green when the dead callable bodies were replaced with failing probes before deletion. No tests, workflows, documentation, dependencies, or user-visible behavior changed.