✅ 2.1.1 Tool Usage Quick Reference (Read First) Use this section before any edits. It defines when and how to use the new doc-lifecycle tools. - Always set project first : . All doc actions require a project registry. - Doc keys are strict : Structural actions validate against . Unknown docs fail with (no healing). - apply patch (structured default) : Use for most edits. Provide payloads (replace range / replace block / replace section). Ambiguous anchors fail with line lists; code fences are ignored in replace block. - replace range : Use when you already have body-relative line numbers (fro…