T9208: add scutum to docs CI branch enumerations (#2199)

* T9208: add scutum to docs CI branch enumerations

The scutum docs branch (VyOS 1.6 train) was cut from circinus on
2026-08-13. Register it in the branch enumerations that gate CI on the
default branch:

- context7-refresh.yml: add scutum to the push-trigger branch list, the
  workflow_dispatch choice options and the defence-in-depth variant
  allow-list, so a docs push on scutum refreshes its own Context7
  variant instead of being dropped.
- context7.json: add a `scutum` entry to `previousVersions`. Context7
  registers branch variants from this file on the default branch; a
  refresh with `branch: "scutum"` 404s until that registration exists.

Enumerations only — no behaviour change for the existing rolling,
circinus and sagitta variants.

🤖 Generated by [robots](https://vyos.io)

* T9208: add scutum to the context7 branch-to-version mapping rule

The previousVersions entry registers the scutum variant, but the
branch-to-version mapping rule Context7 feeds to the model still jumped
straight from rolling to circinus and claimed rolling covers "1.6+" —
the version scutum now serves. Add the scutum row and drop the stale
version claim from rolling so the rule matches the variant list.

Caught by adversarial review on 2b10f78.

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