Add calendar cache layer, incremental sync tests, completion assertions

- Google Calendar events now cached via CacheFetcher pattern with
  stale-cache fallback on API errors (new migration 015, store methods,
  fetchCalendarEvents handler, BuildTimeline reads from store)
- Todoist incremental sync path covered by 5 new tests
- Task completion tests assert response body, headers, and template data

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

1 files changed, 1 insertions, 1 deletions

diff --git a/internal/handlers/agent.go b/internal/handlers/agent.go
index 15715bc..b285520 100644
--- a/internal/handlers/agent.go
+++ b/internal/handlers/agent.go
@@ -322,7 +322,7 @@ func (h *Handler) HandleAgentContext(w http.ResponseWriter, r *http.Request) {
 // buildAgentContext builds the context timeline by reusing BuildTimeline
 func (h *Handler) buildAgentContext(ctx context.Context, start, end time.Time) []agentContextItem {
 	// Reuse the main BuildTimeline function (excludes live API calls for Google services)
-	timelineItems, err := BuildTimeline(ctx, h.store, nil, nil, start, end)
+	timelineItems, err := BuildTimeline(ctx, h.store, nil, start, end)
 	if err != nil {
 		return nil
 	}