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Implements c_project_create (03-C §3.0) as a plain function for U-007 to wire up later: idempotent by target_folder_path, creates .graphlemon/ + one init commit in an existing git repo, PATH_NOT_FOUND/PATH_NOT_WRITABLE/ GIT_INIT_DECLINED per contract, never silently `git init`s (02-V §2.1). Also corrects a real SDD-vs-plan conflict found while scoping this Unit: development-plan.md's U-002 line cited architecture doc §7.3's directory tree (.claude/agents/, skills/, top-level runs/) as what to create inside a target project. But §13.1 (a later, confirmed decision) states those are graphlemon's own platform-repo assets (U-003 scope), and 01-M's own graphlemon_subdir_initialized field already points at §13.2, whose target- project tree is only .git/ + .graphlemon/ + the target's pre-existing src/. §7.3 predates the "target project is an independent code space" pivot and was superseded by it. Corrected development-plan.md, unit_matrix.json, CLAUDE.md, and 05-实施约束与依赖.md accordingly (user confirmed, 2026-07-31). 23 stdlib unittest cases (src/test_schema.py + new src/test_project_scaffold.py), all passing. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>