Head 29ce300674. Same isolated real dev server/fixture as before/after.
At 21:15:05 UTC, browser reconnected and authenticated server.reportClientActivity accepted a foreground lease (web, visible/focused/recentlyInteracted true, ttl120000) via real RPC. No thread mutation was made.
2026-10-22 21:15:11.519877+00:00 GitHubGraphQlAuth.execute {"github.kind": "graphql", "github.graphql.query_hash": "db22b20a", "github.host": "github.com", "github.operation": "listPullRequestsByHead", "http.response.status_code": 200, "github.ratelimit.limit": 5000, "github.ratelimit.remaining": 4497, "github.ratelimit.used": 503, "github.ratelimit.reset": 1792706857, "github.ratelimit.resource": "graphql"}
2026-10-22 21:15:10.878175+00:00 branchPullRequest {}
2026-10-22 21:15:10.872060+00:00 ThreadPullRequestServiceV2.synchronize {}
2026-10-22 21:15:12.474183+00:00 GitHubGraphQlAuth.execute {"github.kind": "graphql", "github.graphql.query_hash": "455c0202", "github.host": "github.com", "github.operation": "getPullRequestSummary", "http.response.status_code": 200, "github.ratelimit.limit": 5000, "github.ratelimit.remaining": 4478, "github.ratelimit.used": 522, "github.ratelimit.reset": 1792706849, "github.ratelimit.resource": "graphql"}
Periodic branch discovery resumed at next tick 21:15:10, success listPullRequestsByHead 21:15:11. Browser navigated away again and server stopped by owned terminal session after capture.
Other existing PR-summary polling continued during idle; no claim that all idle GitHub requests stop.