CB-RES-0003 measured 84 turns and $15.33 — the largest mechanical category — spent prefixing commands with `cd` and `export PATH="$HOME/.cargo/bin:$PATH"`. Both causes are now fixed once instead of per-leaf. tools/repo.py resolves the repo root from __file__ and cargo from PATH then the standard rustup locations. Every tool imports ROOT from it, so the repo path is stated once rather than redefined in four files — single source of fact, the rule DFD earned in InnerLoop v1.2. rule-coverage and dep-weight now call enter_root(), which is why their relative paths did not need rewriting one by one. The Makefile derives REPO from MAKEFILE_LIST and resolves CARGO the same way, so `make -C <repo> <target>` works from any directory with no prefix. make env-test is the positive control, and is in `make all`: every tool runs from / with PATH=/usr/bin:/bin. Without it this fix could regress silently and invalidate T05's measurement — the whole point of the control loop. dep-weight's "cargo not on PATH" error is kept rather than deleted. It should now be unreachable, and --self-test asserts cargo_bin() resolves unaided; a control that never fires is cheaper than a regression. loop-lint failed on repo.py on its first run — a reporting tool with a positive control but no --self-test entry point. Second time the gate has caught work from its own pass within the hour. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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