chore(graceful-handoff): 2.0.0 — bump version, remove auto_discover, update CHANGELOG [skip-docs]

Step 8 of v2.0 plan.

plugins/graceful-handoff/.claude-plugin/plugin.json

@@ -1,11 +1,10 @@
 {
   "name": "graceful-handoff",
-  "version": "1.0.0",
-  "description": "Produce session-handoff artifacts, commit and push pending work, and print a copy-paste prompt for the next session. Designed for context-constrained models like Opus 4.7 where sessions fill fast.",
+  "version": "2.0.0",
+  "description": "Auto-trigger session handoff at context-threshold (Stop hook + statusLine hint), with manual /graceful-handoff fallback. Skill-architecture (disable-model-invocation: true) + JSON pipeline + auto-load on session resume.",
   "author": {
     "name": "Kjell Tore Guttormsen"
   },
-  "auto_discover": true,
   "license": "MIT",
   "repository": "https://git.fromaitochitta.com/open/ktg-plugin-marketplace",
   "keywords": [
@@ -14,6 +13,8 @@
     "context-management",
     "opus-4.7",
     "git",
-    "workflow"
+    "workflow",
+    "auto-trigger",
+    "skills"
   ]
 }