Rewrite script/test to the canonical race-enabled pattern (closes #67)

script/test now runs go test -timeout 30s -race -cover ./..., quiet on success and rerunning verbose on failure. -race exposed a data race on the process-global apex/log logger: Init reconfigured it on every CLI run while other goroutines logged through it. internal/log now mutates the global under the write lock and reads it under the read lock; WithError is dropped because its Entry logged outside that lock, and run() reports a failed command's error via log.Errorf instead (still shown under -q). The corruption fuzz test is scaled to 1500 files / 100 iterations to fit the budget under -race; it pins the same claims at reduced breadth. Independent review ran the Docker lint gate uncached.

Model: opus-4-8 (implementation, review)
model: claude-fable-5

TODO.md

@@ -24,6 +24,9 @@ only thing left of the `chore/align-repo-policies` branch is the list below.
 
 # Completed Steps
 
+- 2026-09-21: rewrote `script/test` to the canonical pattern (30s timeout,
+  `-race -cover`, quiet-first with verbose-on-failure rerun) and fixed the
+  process-global logger data race it surfaced (#67)
 - 2026-09-21: added the canonical `.editorconfig`, made `.gitignore` cover
   secrets, OS, editor, and Go artifacts, and removed the dead Drone CI
   references from `.gitignore` and `bin/gitrev.sh` (#72)
@@ -65,7 +68,6 @@ only thing left of the `chore/align-repo-policies` branch is the list below.
     - Move FORMAT.md from repo root to docs/ and update the AGENTS.md reference
     - Pin Makefile-installed Go tools (`protoc-gen-go@v1.28.1`,
       `golangci-lint@v2.12.2`) by module hash, not mutable tag
-    - Set `make test` timeout to 30s (currently 10s)
     - Add explicit README "Rationale" heading (content exists under other
       names); name the author in the README Description first line
     - Reconcile root-level AGENTS.md with directory-hygiene policy (keep or