chore: release v2.14.0

feat(telemetry): comprehensive observability expansion

- Rewrite TelemetryService with 15 event helpers (up from 7)
- Add rich activation context: vscode/os/node version, copilot chat state
- Add deactivation session summary: duration, total commands + requests
- Extend server.started with ws, mcp, model family, concurrency, key flags
- Extend server.stopped with uptime and error rate buckets
- Extend request.completed with endpoint, token/message count buckets,
  hasTools, hasSystemPrompt, finishReason, cacheHit
- Add request.error event: per-request error category classification
- Add rateLimit.hit event wired to 429 rate-limit rejection path
- Add model.switched event after quickpick model change
- Add config.changed event via workspace configuration listener
- Add ws.connected/message/disconnected/error events in WS handler
- Add uriHandler.invoked event for deep-link paths
- Add perf.heartbeat every 5 min: heap, uptime, rpm, error rate
- Wire telemetryCommand to all 3 chat commands (were untracked)
- Add bucketEndpoint() helper for low-cardinality App Insights dimensions
- Export shared bucketing utilities from TelemetryService

deps: bump lint-staged 17.0.4, typescript-eslint 8.59.3,
      @types/node 25.7.0, ws 8.20.1 (security fix)

Author: suhaibbinyounis

CHANGELOG.md

@@ -4,6 +4,37 @@ All notable changes to the "github-copilot-api-vscode" extension will be documen
 
 Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
 
+## [2.14.0] - 2026-05-18
+
+### Added
+- **Comprehensive Telemetry:** Expanded from 7 sparse events to 15 rich telemetry helpers, giving deep observability via Azure Application Insights.
+  - **Activation context:** VS Code version, OS platform/arch, Node version, Copilot Chat presence, extension version.
+  - **Deactivation summary:** Session duration bucket, total commands and requests served this session.
+  - **Server start (extended):** WebSocket enabled, MCP enabled, model family, max concurrency, API key presence, rate-limit presence.
+  - **Server stop (extended):** Uptime bucket, total requests, error rate bucket.
+  - **Request details (extended):** Endpoint bucket, token-in/out buckets, message-count bucket, streaming flag, tool use flag, system-prompt flag, finish reason.
+  - **New `request.error` event:** Per-request error category (auth / rate_limit / timeout / server_error / client_error).
+  - **New `rateLimit.hit` event:** Endpoint and limit type when a 429 is returned.
+  - **New `model.switched` event:** Old/new model family and trigger source (quickpick / api / config).
+  - **New `config.changed` event:** Setting key changed (never the value) and whether a server restart followed.
+  - **New `ws.*` events:** WebSocket `connected`, `message` (type only), `disconnected`, `error` lifecycle.
+  - **New `uriHandler.invoked` event:** Deep-link path used (`/dashboard`, `/start`, `/stop`).
+  - **Performance heartbeat (`perf.heartbeat`):** Fires every 5 minutes while the server is running — heap MB bucket, uptime, RPM, error rate, server state.
+  - **All 3 chat commands now tracked:** `openCopilotChat`, `askCopilot`, `askSelectionWithCopilot` — previously had no telemetry.
+  - **Shared bucketing utilities:** `durationBucket`, `tokenBucket`, `messageCountBucket`, `uptimeBucket`, `heapMbBucket`, `modelFamily` exported from TelemetryService to eliminate duplicated logic.
+  - **`bucketEndpoint()` helper:** Maps raw URL paths to stable, low-cardinality App Insights dimension labels.
+
+### Changed
+- `telemetryServerStarted` props extended (`hostBucket`, `enableWebSocket`, `enableMcp`, `modelFamily`, `maxConcurrency`, `hasApiKey`, `hasRateLimit`).
+- `telemetryServerStopped` now includes uptime and request-count context.
+- `telemetryServerError` and `telemetryTunnelStarted` updated to use structured props objects.
+
+### Dependencies
+- `lint-staged` 17.0.2 → 17.0.4
+- `typescript-eslint` 8.59.2 → 8.59.3
+- `@types/node` 25.6.0 → 25.7.0
+- `ws` 8.20.0 → 8.20.1 (security fix: uninitialized memory disclosure in `websocket.close()`)
+
 ## [2.10.2] - 2026-03-09
 
 ### Fixed