fix(plugins): make the 10 focused plugins installable, finish the AgentHub rename

The ten `agenthub-*` plugins were listed by the marketplace but could never be
installed — two schema mistakes present since the entries were first authored
(57dc915), both invisible until you actually run `claude plugin install`:

- marketplace entries used `"path": "plugins/<name>"`; the CLI only accepts
  `"source"`, so every one failed with
  `This plugin's marketplace entry is invalid: source: Invalid input`
- each `plugin.json` carried npm's `"repository": { "type", "url" }` object;
  the schema wants a plain string, so the next attempt failed with
  `Validation errors: repository: Invalid input`

Verified by installing all 11 entries into a throwaway CLAUDE_CONFIG_DIR:
1/11 before, 11/11 after. `plugins-marketplace.test.js` was asserting the
broken shape, which is why CI stayed green — it now asserts `source` and
rejects `path`.

Marketplace renamed `claude-code-agent-monitor-plugins` -> `agenthub`, so the
install line is `agenthub@agenthub`. ARCHITECTURE.md documented a marketplace
name (`smartgift-claude-code-monitor`) that never existed in any revision.

The documented `/plugin marketplace add Smartgift-AI/Claude-Code-Monitor` also
never worked: the `owner/repo` shorthand resolves to github.com only, and this
repo is self-hosted on Gitea. Confirmed the CLI rejects `host/owner/repo` and
ignores GH_HOST / GITHUB_HOST / CLAUDE_CODE_MARKETPLACE_URL, so the full
https:// clone URL is the only supported form. Same GitHub-habit class fixed
elsewhere: raw.githubusercontent.com icon URLs (404, and the repo ships
favicon.svg not favicon.ico — the client had the same dead /favicon.ico),
a smartgift.github.io docs link (404), and Gitea `/blob/<ref>/` paths that
must be `/src/branch/<ref>/`.

Repository renamed to Smartgift-AI/AgentHub throughout. Gitea 301-redirects
the old name, so these were stale rather than broken; `docs/superpowers/`
keeps the old name because those are dated decision records.

Adds `repo-links.test.js` to guard both classes (it runs under the existing
pre-commit gate) plus an openapi.yaml drift check — the committed spec had
silently fallen a minor version behind package.json. `generate-openapi-yaml.js`
now exports `render()` so the test compares against one definition of the dump
options instead of a second copy.

ARCHITECTURE.md

@@ -1779,7 +1779,7 @@ Skills are namespaced: `/agenthub-analytics:session-report`, `/agenthub-producti
 | **agenthub-config** | `config-audit`, `memory-review`, `skill-inventory`, `mcp-audit`, `hook-inventory` | `config-auditor` | — | — |
 | **agenthub-dashboard** | `dashboard-status`, `quick-stats` | — | — | — |
 
-**Totals**: 10 plugins, 53 skills, 14 agents, 30 slash commands, 3 CLI tools, 3 hook configurations. Each plugin is installable via `claude plugin install <name>@smartgift-claude-code-monitor`, and a server test (`server/__tests__/plugins-marketplace.test.js`) validates the marketplace↔directory bijection plus every `plugin.json`, agent, skill, and command.
+**Totals**: 10 plugins, 53 skills, 14 agents, 30 slash commands, 3 CLI tools, 3 hook configurations. Each plugin is installable via `claude plugin install <name>@agenthub`, and a server test (`server/__tests__/plugins-marketplace.test.js`) validates the marketplace↔directory bijection plus every `plugin.json`, agent, skill, and command.
 
 ### Data Model Grounding
 
@@ -1808,8 +1808,8 @@ Plugins compute these from raw API data:
 
 ```bash
 # Marketplace install
-claude plugin marketplace add Smartgift-AI/Claude-Code-Monitor
-claude plugin install agenthub-analytics@smartgift-claude-code-monitor
+claude plugin marketplace add https://git.smartgift.io.vn/Smartgift-AI/AgentHub.git
+claude plugin install agenthub-analytics@agenthub
 
 # Local development testing
 claude --plugin-dir plugins/agenthub-analytics