docstring-scan-test calibration commit is a pre-squash PR head, unreachable from main: Self Test red since #1073 #1099

Defect

scripts/tests/docstring-scan-test.sh was added in #1073 (4b2a347). Its calibration step asserts that commit 1cc72cdc80c9 is present. That commit is PR #1034's pre-squash head. #1034 was squash-merged as c56f4ecc, so 1cc72cdc80c9 lives only under refs/pull/1034/head and no clone of main contains it, however deep. The remedy the test prints, "fetch full history", cannot cure it, because Self Test already checks out with fetch-depth: 0.

Measured:

• Self Test on main push 74d2f66f fails (run 36741131926). Two test files fail: the stale registry (main red: REGISTRY source_hash drift after #1072/#1075 reds Registry Verify and Repo self-tests (and skips the lock-gate pin guard) #1092) and this one, FAIL calibration commit present (fetch full history).
• Every standards PR since has inherited the red, for example run 36786626990.

Cure

On a miss, fetch the calibration commit by full SHA, then re-check. Keep the fail-closed bad assertion when the fetch fails.

• Use git fetch --quiet --no-tags origin <full sha> without --depth. In a complete clone, --depth writes .git/shallow and truncates main's history for every later test in the job.
• The calibration commit and its CodeRabbit cross-reference (13 functions / 2 files / 0.00% / 3 skipped) stay unchanged.

Acceptance criteria

• docstring-scan-test.sh passes in CI on a fetch-depth: 0 checkout of main, and the calibration row reports files=2, functions=13, documented=0, skipped=3, coverage=0.00%.
• In a clone without network access to the object, the test still FAILS on the calibration row. A skip is not a pass.
• The checkout is still not shallow after the test runs (no .git/shallow in the common dir).
• Self Test is green on main after the cure lands.

The cure is folded into #1088. It can't land separately under the fully-green rule, because a standalone PR would be red on #1088's other cures.

🤖 Generated with Claude Code

https://claude.ai/code/session_01QYY8Gp4v4x2J7iSNn1vZ57