fix(telemetry): move posthog-node from optional peer to core dependency

posthog-node was an optional peerDependency that no user installed,
resulting in 0 telemetry. Moving it to dependencies ensures it is
always available. Bumps @betterdb/semantic-cache to 0.5.1 and
@betterdb/agent-cache to 0.6.1.

Author: KIvanow

packages/agent-cache/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@betterdb/agent-cache",
-  "version": "0.6.0",
+  "version": "0.6.1",
   "description": "Multi-tier exact-match cache for AI agent workloads backed by Valkey. LLM responses, tool results, and session state with built-in OpenTelemetry and Prometheus instrumentation.",
   "keywords": [
     "valkey",
@@ -77,6 +77,7 @@
   },
   "dependencies": {
     "@opentelemetry/api": "^1.9.0",
+    "posthog-node": ">=4.0.0",
     "prom-client": "^15.1.3"
   },
   "devDependencies": {
@@ -100,7 +101,6 @@
     "@langchain/core": ">=0.3.0",
     "@langchain/langgraph-checkpoint": ">=0.1.0",
     "ai": "^6.0.135",
-    "posthog-node": ">=4.0.0",
     "openai": ">=6.0.0",
     "@anthropic-ai/sdk": ">=0.90.0",
     "@llamaindex/core": ">=0.6.0"
@@ -115,9 +115,6 @@
     "ai": {
       "optional": true
     },
-    "posthog-node": {
-      "optional": true
-    },
     "openai": {
       "optional": true
     },

packages/semantic-cache/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@betterdb/semantic-cache",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "description": "Valkey-native semantic cache for LLM applications with built-in OpenTelemetry and Prometheus instrumentation",
   "keywords": [
     "valkey",
@@ -103,6 +103,7 @@
   },
   "dependencies": {
     "@opentelemetry/api": "^1.9.0",
+    "posthog-node": ">=4.0.0",
     "prom-client": "^15.1.3"
   },
   "devDependencies": {
@@ -121,7 +122,6 @@
     "node": ">=20.0.0"
   },
   "peerDependencies": {
-    "posthog-node": ">=4.0.0",
     "@anthropic-ai/sdk": ">=0.90.0",
     "@langchain/core": ">=0.3.0",
     "@langchain/langgraph-checkpoint": ">=0.1.0",
@@ -131,9 +131,6 @@
     "openai": ">=6.0.0"
   },
   "peerDependenciesMeta": {
-    "posthog-node": {
-      "optional": true
-    },
     "@anthropic-ai/sdk": {
       "optional": true
     },