CB-600: make it safe to install the launchd agent

- redeploy-bridged.sh now refuses (not warns) a supervised restart when
  its computed log path disagrees with the loaded plist's StandardOutPath
  — otherwise every post-restart check reads the wrong file and can
  report a clean restart while the daemon crash-loops. The check is a
  pure, testable function; the script gained a source-for-test guard so
  it can be exercised without installing the agent or touching launchd.
- a failed 'launchctl load' after a successful 'unload' now retries once
  and, on ultimate failure, tells the operator the agent is stopped AND
  disabled plus the exact recovery command, instead of leaving that
  silently worse than the pre-redeploy state.
- the plist documents honestly that the crash loop launchd retries is
  unbounded (ThrottleInterval only paces it), and what actually stops it.
- fixed the requiredSecretEnvVars javadoc: the auth.tokenEnv startup
  throw is ~370 lines below its call site, not a few lines above it, and
  only fires in auth.mode: token.

bridged/src/main/java/dev/ltms/bridged/Bridged.java

@@ -555,7 +555,10 @@ public final class Bridged {
      * where set (opt-in). Derived from the config, not hard-coded, so a new profile is covered for
      * free. A var required by more than one profile is one entry naming every profile that needs
      * it. Deliberately excludes {@code auth.tokenEnv}: that one is already enforced loudly, by a
-     * startup throw, a few lines above this method's call site.
+     * startup throw in {@code main()} — about 370 lines <em>below</em> this method's call site
+     * ({@link #reportRequiredSecrets(BridgedConfig)}), not a few lines above it. That throw only
+     * fires when {@code auth.mode: token} is configured; under the default loopback-trust mode it
+     * never runs, and {@code auth.tokenEnv} is simply not required.
      *
      * <p>Package-private and pure (no I/O, no logging) so the derivation is unit-testable without
      * capturing log output; {@link #reportRequiredSecrets(BridgedConfig)} is the logging caller.