chore: publish latest schema snapshot

Author: ZEDIUM-Off

CONTEXT.json

@@ -1,5 +1,5 @@
 {
-	"$schema": "https://raw.githubusercontent.com/ZEDIUM-Off/pi-context-tree/v0.4.0/schemas/context.schema.json",
+	"$schema": "https://raw.githubusercontent.com/ZEDIUM-Off/pi-context-tree/main/schemas/versions/latest/context.schema.json",
 	"stability": {
 		"state": "stable",
 		"summary": "Repository-wide extension configuration and docs are usable baseline; prefer narrower child scope stability when present.",

docs/release-checklist.md

@@ -84,6 +84,7 @@ Expected tarball contents should include:
 ```text
 src/**
 schemas/context.schema.json
+schemas/versions/latest/context.schema.json
 README.md
 AGENTS.md
 CONTRIBUTING.md
@@ -118,6 +119,21 @@ Expected:
 Context Tree validation: ...
 ```
 
+## Schema snapshots
+
+`pnpm schema:release` writes both immutable versioned snapshots and a moving latest snapshot:
+
+```text
+schemas/versions/vX.Y.Z/context.schema.json
+schemas/versions/latest/context.schema.json
+```
+
+Repository `CONTEXT.json` files should use the latest schema URL so validation catches drift against the current schema immediately:
+
+```json
+"$schema": "https://raw.githubusercontent.com/ZEDIUM-Off/pi-context-tree/main/schemas/versions/latest/context.schema.json"
+```
+
 ## Versioning
 
 Current public line is `0.2.x`.