fix(test-infra): judge uses resolveClaudeBinary; eval:watch reads the real partials dir

judgePtyState spawned the bare string 'claude' three definitions below the
resolveClaudeBinary() helper this same file exports — broken under hermetic
PATHs where every other launch in the file resolves correctly.

eval:watch read _partial-e2e.json from the legacy global ~/.gstack-dev/evals/
while EvalCollector writes it into the per-project eval dir (or
GSTACK_EVAL_DIR) — so the dashboard's completed-tests panel was empty
whenever slug detection succeeded, i.e. the normal case. The heartbeat and
per-run progress logs stay global by design (session-runner.ts: 'heartbeat
stays global'). The three eval-CLI docstrings stop claiming the legacy dir
is the primary location.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/eval-summary.ts

@@ -1,6 +1,7 @@
 #!/usr/bin/env bun
 /**
- * Aggregate summary of all eval runs from ~/.gstack-dev/evals/
+ * Aggregate summary of eval runs from the project eval dir
+ * (~/.gstack/projects/<slug>/evals; legacy fallback ~/.gstack-dev/evals)
  *
  * Usage: bun run eval:summary
  */