Extend baseline-register schema with exact-commit and dependency columns (RC time) #207

Change

Extend configuration-management/baseline-register.md so each baseline row identifies:

• the exact commit SHA the baseline is bound to;
• the pinned dependencies in effect (Sysand lock digests, tool versions).

The v0.1.0 release gate (ROADMAP.md) requires the register row to identify "exact commit" and "dependencies"; today's register schema has neither column, so the gate is unsatisfiable until this lands.

Timing

At v0.1.0 release-candidate time, per the release gate. Do not land earlier: the register's single existing row (BL-MW-010-P12) is unchanged until RC.

Part of #200 (RC-time slice).