refactor: move session/transcript runtime state to SQLite

Migrate OpenClaw session, transcript, and runtime state off per-file
.jsonl/JSON storage onto the SQLite state and agent databases, brought up to
date with current main. Channel plugins persist via the plugin-state SDK
keyed-store seam rather than the raw DB; storage-heavy plugins keep their own
SQLite stores via SDK path helpers.

docs/plugins/reference/canvas.md

@@ -17,3 +17,7 @@ Experimental Canvas control and A2UI rendering surfaces for paired nodes.
 ## Surface
 
 contracts: tools
+
+Managed Canvas documents are stored in SQLite plugin blob rows. Set
+`plugins.entries.canvas.config.host.root` only when you intentionally want the
+host to serve operator-managed files from a directory.

docs/plugins/reference/skill-workshop.md

@@ -0,0 +1,23 @@
+---
+summary: "Captures repeatable workflows as workspace skills, with pending review, safe writes, and skill prompt refresh."
+read_when:
+  - You are installing, configuring, or auditing the skill-workshop plugin
+title: "Skill Workshop plugin"
+---
+
+# Skill Workshop plugin
+
+Captures repeatable workflows as workspace skills, with pending review, safe writes, and skill prompt refresh.
+
+## Distribution
+
+- Package: `@openclaw/skill-workshop`
+- Install route: included in OpenClaw
+
+## Surface
+
+contracts: tools
+
+## Related docs
+
+- [skill-workshop](/plugins/skill-workshop)