refactor: eradicate deprecated tools (sticky_notes, pinned_files, context_workspaces, pr_checklist, preferences) and dead code

EFFECTIVE_DISCOURSE.md

@@ -87,9 +87,9 @@ When the LLM is first analyzing a repository, don't let it run `ls -R` and guess
 ## 11. Graph, Memory & Casing Standards
 Actively instruct the LLM to maintain its memory constraints and use canonical casing.
 * **Do say:** "Log this architectural decision in the knowledge graph using PascalCase for entity types."
-* **Do say:** "Add a sticky note with the test database credentials for this session with a 1-hour TTL."
+* **Do say:** "Leave a handoff memo with the test database credentials and session action items."
 * **Do say:** "Create a milestone for the 'Rich Clipboard' feature and break it down into active tasks."
-* **Tools Triggered:** `create_entities`, `decisions` (log), `sticky_notes` (add), `milestones` (add), `tasks` (add)
+* **Tools Triggered:** `create_entities`, `decisions` (log), `handoff_memos` (leave), `milestones` (add), `tasks` (add)
 
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@@ -121,10 +121,10 @@ Actively instruct the LLM to maintain its memory constraints and use canonical c
 
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-## 16. Context Workspace Diffing
-* **Don't say:** "What is the difference between my feature workspace and the main workspace?"
-* **Do say:** "Diff context workspaces between 'feature-branch' and 'main'."
-* **Tool Triggered:** `diff_context_workspaces`
+## 16. State Checkpoints & Rollbacks
+* **Don't say:** "Save a backup snapshot before we do this refactor."
+* **Do say:** "Create a checkpoint named 'pre-refactor' before editing the database layer."
+* **Tool Triggered:** `manage_checkpoint`
 
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