Updated all docs, skills, and examples to use year-month archive files (`*_<YYYY>_<MM>.md`) for `_ISSUES.md`, `_TODO.md`, and `LLM_PROTOCOL_DECISIONS.md`. Decision Log rolling window now governed by LLMP-DEC-67 (last 15 entries active). Clarified archive file handling, updated uniqueness checks, and revised references throughout. Closed and documented resolution for `FBANKAPP-DMODEL-I-P6X4` in `DATAMODEL_ISSUES.md`.
Refactor SIGDS docs, archive DEC log, add pipe tests
- Updated all references to AcSignalRDataSource docs to new SIGNALR_DATASOURCE/README.md location; introduced SIGDS topic and paired issues/TODO files.
- Implemented new Decision Log archival policy: last-15-active entries remain, older entries moved to year-month archive (LLMP-DEC-65, 67); updated docs-archive skill for two-rule rotation.
- Added new SIGDS architectural TODO (ACCORE-SIGDS-T-D9F2) for relocating DataSource code.
- Updated doc tables, glossaries, and conventions for SIGDS.
- Added AcBinarySerializerPipeParallelTests.cs for parallel serialization/deserialization round-trip tests.
Loretta