feat(primer): fire Codex primer unconditionally like the Claude primer

Raise CODEX_PRIMER_MAX_USAGE_PCT from 1 to 100 so the Codex usage-window
primer fires at every fixed KST slot regardless of current 5h usage level,
mirroring the Claude primer (which always fires unless rate-limited). The d7
gate stays at 100 so an account whose weekly quota is exhausted is still
skipped, matching Claude's rate-limit skip.

Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>

src/usage-primer.test.ts

@@ -54,7 +54,7 @@ vi.mock('./codex-warmup.js', () => ({
 }));
 
 describe('usage-primer', () => {
-  it('refreshes Codex usage before primer selection and allows 1% fresh usage', async () => {
+  it('refreshes Codex usage before primer selection and fires regardless of usage level', async () => {
     callOrder.length = 0;
     refreshAllCodexAccountUsage.mockClear();
     refreshActiveCodexUsage.mockClear();
@@ -68,7 +68,7 @@ describe('usage-primer', () => {
       expect.objectContaining({
         enabled: true,
         minIntervalMs: 18_000_000,
-        maxUsagePct: 1,
+        maxUsagePct: 100,
         maxD7UsagePct: 100,
       }),
       { ignoreZeroUsageWindow: true },