Add infra-ops-toolkit plugin: topology diagram, html-to-pdf, teleport onboarding skills

Distills patterns from the Teleport access topology work: verified-data diagram
building, as-displayed HTML-to-PDF export via headless Chromium, and
container-scoped/host/database onboarding into an existing Teleport cluster.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01R3ZTfgQrkR3q8DSEoZAmvs

plugins/infra-ops-toolkit/README.md

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+# infra-ops-toolkit
+
+Three skills distilled from real infrastructure work, for anyone building infra documentation or onboarding resources into Teleport:
+
+- **topology-diagram** — build/update a light-theme HTML+SVG access topology diagram (mirrored into a `.drawio.xml`), always re-verifying every IP/spec/capacity against live sources (`doctl`, `aws`, `tsh`) instead of trusting the diagram's own prior state.
+- **html-to-pdf** — export any HTML page to a PDF that matches its live browser rendering exactly, using headless Chromium in screen mode with a content-sized page, instead of fighting a browser's fixed-paper Print dialog.
+- **teleport-onboard** — onboard a new VPS, EC2 host, container-scoped app login, or database into a Teleport cluster by discovering and mirroring the team's existing patterns (forced-login-shell wrapper scripts, scoped sudoers, `tctl`-created roles) rather than inventing a new access model.
+
+## Install
+
+Install `infra-ops-toolkit` from the `infra-plugins` marketplace. Skills activate automatically when a prompt matches their description, or invoke directly: `/topology-diagram`, `/html-to-pdf`, `/teleport-onboard`.