[rivassec]

Item 6 of the improvement list.

What

• New partial/series_nav.html: posts sharing a Series: frontmatter value render an ordered part list (sorted by date) between the header and the TOC, with aria-current on the current part.
• Draft-safe by construction: the list is computed from articles (published posts only), and the box suppresses itself below 2 published members - so tagging a post whose series siblings are still drafts renders nothing until they publish, and no live page can ever link a draft.
• Series links are template-generated structural nav, so they don't count against the link-graph guard's 2-outbound in-body cap - series give the arcs the internal linking the cap deliberately keeps scarce.
• CSS matches the existing aside/bio boxes (accent left border, elevation vars).

Wired series

• Hiring as an Adversarial System: trust-decay + hiring-discovery (box renders now; the third part joins on its publish day)
• Anatomy of a Container Incident: cryptominer (box hidden until the companion post publishes, then both gain it automatically)

Verified locally

• Box renders on both hiring posts with correct order + current-page marking; suppressed on cryptominer (1 member) and absent on unrelated posts
• link-graph, descriptions, em-dash, wellknown/llms guards green; 27 tests pass