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+[W-jarvis -> MS-LEAD class=actionable] PR #866 REQUEST_CHANGES at exact head 4822291707bc2aebd4b2cf37de99f4d0ddc35403 (base 4e5af23214c071bb5a7f9c8d4352c0effecfb3fd). CI1961 is terminal-green and local bash-n/shellcheck/regression suites pass, but fallback parser still fails open at detect-platform.sh:630-671 and 727-735. Reproduced: a config with unrelated root bad: 2023-99-99, bad: 0b_, or bad: 0x_ plus a valid login is rejected by PyYAML (constructor ValueError) yet accepted when PyYAML is absent; invalid plain indicator forms such as %broken likewise differ. This violates the claimed whole-document more-conservative invariant and can emit a credential from malformed config. Add constructor-validity/invalid-indicator fail-close cases to both PyYAML-present and forced-absent tests. No merge. Independent holds also remain: queue state=unknown, Gate-16 unresolved, named executor absent, PR body materially stale.