wiring-diagram: who holds what, drawn like MarkM's ERTP slides

A capability wiring diagram as a self-contained HTML/SVG page plus a
headless-Chromium PNG. Every arrow has to point to something in the
code, and a Mallory holding what's likeliest to leak shows what that
doesn't reach. template.html has the drawing helpers, adapted from
capsite's cookie-rotation-wiring.

README: a TODO to consider adapting agoric-sdk's
sequence-diagram-actor-sim as its companion.

Generated-by: Claude Opus 5.5

README.md

@@ -47,6 +47,12 @@ Code](https://code.claude.com/docs/en/skills) and
   TADA, then how, then the challenges, tagged for an emoji retro.
 - [ibis-design](ibis-design/SKILL.md) — search a design space:
   issues, positions, and arguments.
+- [wiring-diagram](wiring-diagram/SKILL.md) — who holds what, drawn
+  like MarkM's ERTP slides: every arrow cites the code, and Mallory
+  shows what a leak doesn't reach.
+  TODO: consider copying or adapting its companion for message order,
+  sequence-diagram-actor-sim (agoric-sdk `.agents/skills/` on branch
+  `connolly/ago-1299-agentic-planning-tdd`).
 - [obsidian-markdown](obsidian-markdown/SKILL.md) — the workspace is
   an Obsidian vault: one line per paragraph, relative links, no file
   symlinks you expect Obsidian to show.