atrium-catalog-watcher

> **${var}** — Optional. `dry-run` skips notify (state still updates and article still writes). Empty = normal run. Today is ${today}. The `install-from-atrium` script (merged in PR #335, the third skill install path after `add-skill` and `install-skill-pack`) fetches skills from the Atrium onchain marketplace at `https://atriumhermes.tech/.well-known/skills/index.json`. The endpoint is the live source of truth for everything publishable through `./install-from-atrium <name>`, but the operator has no signal when new skills appear in it. A skill that ships on Atrium is discoverable today only by running `./install-from-atrium --list` by hand. By the time `install-from-atrium` is used reactively (after someone mentions a skill), the skill may already have been live for days. This skill closes that gap. It is a weekly Friday watcher of the Atrium catalog — what was added, what was removed, what was renamed or had its description changed, all reported as a structured digest. Pairs with `sparkleware-catalog` (Tuesday 09:00 — curated `skill-packs.json` registry) as the supply-side equivalent for the *discovered* Atrium marketplace, and with `skill-update-check` (Sunday 19:00 — version drift on already-installed skills) as the **upstream-arrivals** signal that precedes any install decision. Read `memory/MEMORY.md` for context. Read the last 8 days of `memory/logs/` for prior-run context. Read `soul/SOUL.md` + `soul/STYLE.md` if populated to match voice in the notification and art...