phase2: close out — all SPEC §5 exit criteria met

20 audited attempts, 0 shipped false accepts, 3 verified auto-accepted
wins (tokei class-5: +10.7%, +3.7%, +9.9%; ~1.25x vs upstream with
Phase-0 wins). Independent 20-way adversarial re-audit (phase2-final-audit
workflow) confirmed every verdict follows its evidence, correct
equivalence tier, no harness-gaming, ledger append-only intact.

Closeout changes:
- case study: full 20-row attempt table, scoreboard, corrected
  comrak-010 CI upper bound (+12.1%, was +12.2%), exit-criteria section
  flipped to ALL MET, OS-isolation gap marked closed.
- CLAUDE.md Current-phase line: Phase 2 complete, next Phase 3.
- verdict: derive the ledger 'phase' column from the run_id namespace
  (phaseN-*) instead of the hardcoded 1 the re-audit flagged; historical
  rows are immutable and stay as written (run_id prefix is authoritative).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EcKPWQ3MQD4NdEHwar96u2

crates/verdict/src/main.rs

@@ -296,12 +296,22 @@ fn main() -> Result<()> {
         Some(p) => std::fs::read_to_string(p)?,
         None => "(no source patch)".into(),
     };
+    // Derive the phase from the run_id namespace (phaseN-*) so the column
+    // matches the run_id prefix; the historical hardcoded `1` left every
+    // verdict-written row tagged phase 1 regardless of namespace (found in
+    // the phase2-final-audit sweep). Falls back to 1 for un-prefixed ids.
+    let phase = cli
+        .run_id
+        .strip_prefix("phase")
+        .and_then(|r| r.split('-').next())
+        .and_then(|n| n.parse::<u8>().ok())
+        .unwrap_or(1);
     let attempt = Attempt {
         run_id: cli.run_id.clone(),
         timestamp: now_utc(),
         target: cli.target.clone(),
         target_commit: spec.source.commit.clone(),
-        phase: 1,
+        phase,
         hotspot: cli.hotspot,
         playbook_class: cli.playbook_class,
         hypothesis: cli.hypothesis,