RULES v10.66 — Playground Flow Diagram Format Correction

Corrected

Replaced prohibited Unicode Box Drawing branch markers in the Case 04 and Case 12 flow diagrams with allowed arrows, labels, and indentation.
Preserved the existing authenticated/private-access, bounded-correction, deterministic-no-retry, supplied-artifact, and recovery-path semantics without changing branch wording, order, proof strength, or ownership.

All 19 Runtime Rules remain byte-and-mode identical to v10.65.
Runtime Rule designs, per-rule changelogs, installers, fixtures, Case 17, matrix/coverage, and Patch artifacts remain unchanged.
Runtime reinstallation is not required because the Runtime Rule payload and installer order did not change.
Published v10.65 remains immutable with its historical failed post-publication diagram-format gate recorded.

Commit A, Commit B, and cumulative release scopes contain exactly 9, 12, and 13 paths.
Every added Markdown line in the cumulative release diff and both complete corrected scenario files contain zero U+2500–U+257F characters.
Normalized complete-file comparison and explicit phrase/order assertions confirm semantic preservation.
Modes, local links, protected bytes, and working-tree integrity pass.
Bash and PowerShell installer fixture suites pass.
A fresh disposable target passes two identical 19/19 installations with byte-and-mode parity, manifest-order convergence, unrelated-file preservation, no governed/playground installation, and no unexpected quarantine.

v10.66 corrects the presentation defect prospectively; it does not rewrite or move v10.65 or any earlier published release.