feat(06): polish and harden — donna-tools CLI, UAT gate, docs, tool learning, bootstrap refactor#36

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gsd/phase-06-polish-and-harden-version-check-skip-setup-guard-simplify-adjust-tool-uat-merge-gate-docs-and-readme-improvements-enhance-tool-learning-refactor-skill-bootstrappingvinen/donna:gsd/phase-06-polish-and-harden-version-check-skip-setup-guard-simplify-adjust-tool-uat-merge-gate-docs-and-readme-improvements-enhance-tool-learning-refactor-skill-bootstrapCopy head branch name to clipboard