revert: drop premature PR 1 commits from this branch

Reverts both:
- fa61962 test(golden): normalize() — deterministic YAML rendering
- e0280c2 test(golden): add sentinel template directories

These belong in PR 1 (the harness PR), not PR 0 (the design doc PR).
They were authored on this branch in error and pushed to PR #9057
before the mistake was caught. Force-push isn't permitted on protected
feat/* branches, so reverting is the cleanest reset.

The reverted changes are preserved on branch feat/golden-templates-pr1
(plus uncommitted WIP harness.py/test_harness_build.py from a parallel
session) for the upcoming PR 1 to build on.

Author: bnusunny