v13.6.2

What's Changed

Telemetry cost reduction (#2977)

• TelemetryBuffer rollup windows — high-volume session_compressed and context_injected events are now aggregated into 5-minute rollup windows (observer_turn_rollup, context_injected_rollup) before forwarding to PostHog, replacing ~45M individual events/month with ~20K rollup records. Cuts the projected PostHog bill from ~$7,700/mo to ~$10/mo without losing aggregate shape (counts, sums, averages, top model, per-outcome buckets).
• Outcome visibility in context_injected_rollup — added outcomes_ok / outcomes_error buckets so a window of 100% failed injections is distinguishable from one of zero-token successes.

CI

• Windows build pinned to windows-2022 — the windows-latest image moved to windows-2025 (Visual Studio 18), which the bundled node-gyp@11.5.0 can't detect, breaking native tree-sitter rebuilds. Pinned to windows-2022 (VS2022) until node-gyp gains VS18 support.

Full Changelog: v13.6.1...v13.6.2