feat: implement Phase 1B - variance collection automation

Extend nyx-probing with automated variance collection using
nyx-substrate for database persistence. Adds 4 new CLI commands
for collecting and analyzing variance in Echo Probe measurements.

New Features:
- VarianceRunner: Automated 1000x probe collection with progress bars
- 4 new CLI commands:
  - variance collect: Single term variance collection
  - variance batch: Batch collection from glossary files
  - variance stats: View session statistics
  - variance analyze: Cross-session variance analysis
- Full integration with nyx-substrate database layer

Files Added:
- nyx_probing/runners/__init__.py: Runner module initialization
- nyx_probing/runners/variance_runner.py: VarianceRunner class (~200 LOC)
- nyx_probing/cli/variance.py: CLI commands (~250 LOC)

Files Modified:
- pyproject.toml: Added nyx-substrate>=0.1.0 dependency
- nyx_probing/cli/probe.py: Registered variance command group
- data/glossary/master.json: Updated from scanning

Integration:
- nyx-probing → nyx-substrate → phoebe (PostgreSQL)
- Stores each probe run in variance_probe_runs table
- Rich progress bars and statistics display
- Session-based tracking with UUIDs

Usage Examples:
  nyx-probe variance collect "Geworfenheit" --runs 1000
  nyx-probe variance batch depth_3_champions.json
  nyx-probe variance stats <SESSION_ID>
  nyx-probe variance analyze "Geworfenheit"

Status: Phase 1B complete, ready for baseline collection

🌙💜 Generated with Claude Code
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

nyx_probing/cli/probe.py

@@ -31,6 +31,7 @@ from nyx_probing.core.model import NyxModel
 from nyx_probing.probes.surface_probe import SurfaceProbe
 from nyx_probing.probes.echo_probe import EchoProbe
 from nyx_probing.analysis.readiness_scorer import ReadinessScorer
+from nyx_probing.cli.variance import variance
 
 console = Console()
 
@@ -69,12 +70,16 @@ def detect_category(completions: list) -> str:
 def cli():
     """
     🌙 nyx-probe: Probe the Young Mind's conceptual topology.
-    
+
     Explore how Qwen2.5-7B-Base understands and associates concepts.
     """
     pass
 
 
+# Register variance command group
+cli.add_command(variance)
+
+
 @cli.command()
 @click.argument("term")
 @click.option("-n", "--runs", default=3, help="Number of completion runs")