feat: agent status dashboard with availability timeline and Gemini quota detection

- Detect Gemini TerminalQuotaError (daily quota) as BUDGET_EXCEEDED, not generic FAILED
- Surface container stderr tail in error so quota/rate-limit classifiers can match it
- Add agent_events table to persist rate-limit start/recovery events across restarts
- Add GET /api/agents/status endpoint returning live agent state + 24h event history
- Stats dashboard: agent status cards, 24h availability timeline, per-run execution table

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/internal/executor/ratelimit_test.go b/internal/executor/ratelimit_test.go
index f45216f..1434810 100644
--- a/internal/executor/ratelimit_test.go
+++ b/internal/executor/ratelimit_test.go
@@ -77,6 +77,36 @@ func TestParseRetryAfter_NoRetryInfo(t *testing.T) {
 	}
 }
 
+// --- isQuotaExhausted tests ---
+
+func TestIsQuotaExhausted_GeminiDailyQuota(t *testing.T) {
+	err := errors.New("container execution failed: exit status 1\nTerminalQuotaError: You have exhausted your daily quota on this model.")
+	if !isQuotaExhausted(err) {
+		t.Error("want true for Gemini TerminalQuotaError, got false")
+	}
+}
+
+func TestIsQuotaExhausted_GeminiExhaustedMessage(t *testing.T) {
+	err := errors.New("container execution failed: exit status 1\nyou have exhausted your daily quota")
+	if !isQuotaExhausted(err) {
+		t.Error("want true for 'exhausted your daily quota', got false")
+	}
+}
+
+func TestIsQuotaExhausted_GeminiQuotaExceeded(t *testing.T) {
+	err := errors.New("container execution failed: exit status 1\nQuota exceeded for metric: generativelanguage.googleapis.com/generate_content_free_tier_requests")
+	if !isQuotaExhausted(err) {
+		t.Error("want true for Gemini free tier quota exceeded, got false")
+	}
+}
+
+func TestIsQuotaExhausted_NotQuota(t *testing.T) {
+	err := errors.New("container execution failed: exit status 1")
+	if isQuotaExhausted(err) {
+		t.Error("want false for generic exit status 1, got true")
+	}
+}
+
 // --- runWithBackoff tests ---
 
 func TestRunWithBackoff_SuccessOnFirstTry(t *testing.T) {