docs: add tool filtering documentation, changelog, and sidebar - Add Tool-Filtering.md with complete SQLITE_MCP_TOOL_FILTER documentation - Add Changelog.md with version history starting from v2.6.4 - Add _Sidebar.md for wiki navigation - Update Home.md with v2.6.4 tool filtering section - Update Quick-Start.md with v2.6.4 version references Contributor: @Insighttful (PR #50)

Temp committed Dec 6, 2025