fix: remove historical migration info from tools documentation (v2.26.5) (#448)

- Remove "Replaces X, Y, Z..." sentences from full.description in:
  - get_node, validate_node, search_templates, n8n_executions, n8n_get_workflow
- Remove version/issue references from n8n_update_partial_workflow
- Clean up consolidation comments in index.ts
- Documentation now starts directly with functional content
- Estimated token savings: ~128 tokens per full documentation request

Conceived by Romuald Członkowski - www.aiadvisors.pl/en

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

src/mcp/tool-docs/workflow_management/n8n-update-partial-workflow.ts

@@ -90,7 +90,6 @@ Full support for all 8 AI connection types used in n8n AI workflows:
 
 **Important Notes**:
 - **AI nodes do NOT require main connections**: Nodes like OpenAI Chat Model, Postgres Chat Memory, Embeddings OpenAI, and Supabase Vector Store use AI-specific connection types exclusively. They should ONLY have connections like \`ai_languageModel\`, \`ai_memory\`, \`ai_embedding\`, or \`ai_tool\` - NOT \`main\` connections.
-- **Fixed in v2.21.1**: Validation now correctly recognizes AI nodes that only have AI-specific connections without requiring \`main\` connections (resolves issue #357).
 
 **Best Practices**:
 - Always specify \`sourceOutput\` for AI connections (defaults to "main" if omitted)