v0.12.0

Changelog

• 4cecba8 chore: run go mod tidy
• f7ce53a feat: add MCP license tool for license text retrieval
• 08719a7 feat: add export and import MCP tools for keg archives
• a1925d7 feat: add graph MCP tool for KEG visualization
• 5fee719 feat: add import_from_keg MCP tool for cross-keg node import
• 7648405 feat: add repo_init, repo_rm, config, config_template MCP tools
• 91d5c5d feat: add upload/download file and image MCP tools
• 84f414e feat: embed LICENSE in binary and expose via --license flag
• b73c2a0 fix: add missing shell completions for site build and serve
• a2e3443 test: add tests for --license flag, MCP license tool, and completions

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