Docs System 0.12.1

Fixes four product-site template defects: hero graphs cut at the edge, literal backticks in graph descriptions, unhighlighted console fences, and code lines hidden behind the edge fade.
Consumers move their pin to this tag's commit and rebuild; no content or config change is required.

Breaking

• None.

Fixed

• A hero protocol or domain graph always fits its column: the canvas scales down to the column width instead of stopping at 0.8 and overflowing into a card that cut its right edge. HERO_MIN_SCALE is still exported, deprecated, and no longer read.
• Inline code in a graph's description, an entity summary, a protocol node description or a case input renders as <code> instead of showing its Markdown backticks; aria-labels and tooltips drop the backticks.
• A ```console fence is a terminal: bare commands are highlighted as Bash with a drawn $ prompt that cannot be selected and that the copy button leaves out; a transcript that writes its own prompts is highlighted as shell-session. The block is labelled Terminal.
• A code or plain-text line wider than its block wraps inside the block with a 2ch hanging indent, so no part of it sits behind the right edge or its fade. This applies to every fence styled by the shared tokens.

Changelog for 0.12.1

Pull request: #37