T8615: add Mergify config (extends: mergify central template) (#234)

* T8615: add Mergify config (extends: mergify central template)

Adds the org-local central-config inheritance file per the T8615 sweep
(re-scoped 2026-05-28). 4-line minimum: extends: mergify resolves to
vyos/mergify which provides commands_restrictions (9 slash commands x
4-sender allowlist), conflict labeler, PR-title T-ID format check,
opt-in auto-update, and the backport-conflict merge protection.

merge_protections_settings: reporting_method: check-runs declared
explicitly per-repo because only defaults and commands_restrictions are
documented as merging across extends: -- pin to current behavior pre
the 2026-07-31 default flip per data/github.md Mergify gotchas table.

Phase 0 CR: 0 finding(s). Known false positive: CR flags
extends: mergify as 'not a documented built-in preset' but Mergify
documents the org-local form at https://docs.mergify.com/configuration/sharing/.

Refs: T8615 (re-scoped 2026-05-28), IS-421

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* T8615: switch yaml-language-server schema URL to JSON-schema

Replaces the human-docs file-format URL (which serves HTML and cannot
drive editor validation) with the machine-readable JSON-schema URL
that yaml-language-server actually resolves for autocomplete and
schema validation.

Old: https://docs.mergify.com/configuration/file-format/
New: https://docs.mergify.com/mergify-configuration-schema.json

Phase 0 CR: 0 finding(s).

Refs: T8615 (re-scoped 2026-05-28), IS-421

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