Deletes 7 source files that were superseded but never removed:
run.py, grad_proj.py, extract_vhack.py (older twin-NLL extractor),
grpo_smoke.py, grpo_proj_smoke.py (smoke harnesses replaced by
train.py "smoke" subcommand), phase2_analyze.py (pilot is past),
probe_uat.py (UAT pipeline is past).
Drops matching justfile recipes (vhack-check, phase2-analyze,
probe-uat) and the BASE constant that pointed at run.py. Updates
AGENTS/README references to the stale fast-dev-run recipe (now
just smoke / smoke-vanilla).
Verified by running just smoke-vanilla --steps=2 end-to-end.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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