docs(maintainer): add skill knowledge base for cloud-scheduled DOPR agents

Mirror of ~/.claude/skills/mhrv-rs-maintainer/ — SKILL.md plus eight reference
files plus assets. Cloud-scheduled agents clone the repo fresh on each fire
and have no access to the maintainer's local home directory; embedding the
skill in docs/maintainer/ lets them read the same canonical context as the
local maintainer and produce replies indistinguishable from a local DOPR
session.

The local copy at ~/.claude/skills/mhrv-rs-maintainer/ remains the source of
truth; this directory mirrors it.

docs/maintainer/assets/changelog-template.md

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+<!-- see docs/changelog/v1.1.0.md for the file format: Persian, then `---`, then English. -->
+• [توضیح bullet اول به فارسی، با link به issue/PR — مثال: ([#NNN](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/issues/NNN), PR [#MMM](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/pull/MMM) از @contributor)]: شرح آنچه تغییر کرده + چرا اهمیت داره. اطلاعات معماری مرتبط، مقادیر default، و escape hatch‌ها برای کاربرانی که می‌خواهن behavior قدیم رو نگه دارن
+• [bullet دوم — همین structure: تغییر + چرا + escape hatch]
+• [اگر breaking change وجود داره: **شکستگی سازگاری**: شرح breaking + migration steps]
+---
+• [bullet 1 in English ([#NNN](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/issues/NNN), PR [#MMM](https://github.com/therealaleph/MasterHttpRelayVPN-RUST/pull/MMM) by @contributor): description of what changed and why it matters. Architectural context, default values, and escape hatch for users who want to preserve old behavior]
+• [bullet 2 in English with the same structure: change + why + escape hatch]
+• [if breaking change: **Breaking change**: description + migration steps]

docs/maintainer/assets/reply-marker.md

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+---
+<sub>[reply via Anthropic Claude | reviewed by @therealaleph]</sub>