docs: add six shipped connector guides to the hub table (#141)

The connector hub omits six guides already shipped in #138. Add Arcade,
Composio, Executor and Fireflies under Productivity and collaboration,
Railway under Developer tools, and You.com under AI tools, linking to
their existing guides.

Fireflies is explicitly labelled **Live exception; not yet stable**. The
rows retain the guides' unverified setup boundaries, Railway's pending
live qualification, and You.com's reduced free profile. The diff is one
file and six added table rows.

Validation: doc-link resolution (1,978 checks), generated docs build and
crawlable links (76,671 links), authored SEO metadata (266 pages), and
git diff --check pass.

Michael owns review and merge. LOOA-2949 stays open until the merged
table is checked in production.

Co-authored-by: Paperclip <[email protected]>

docs/connectors.md

@@ -67,7 +67,11 @@ Find an app and open its setup guide.
 
 | Connector | What you can do | Connection methods |
 | --- | --- | --- |
+| [Arcade](connectors/arcade.md) | Tool gateway combining the tools you select from several servers behind one URL. Agents use the exposed tools; authentication follows your gateway settings. Setup is unverified. | Gateway URL · Browser sign-in or token/headers |
 | [Asana](connectors/asana.md) | Work management for team projects, tasks, and goals. Agents work with the projects and tasks your Asana app can reach. | Your own OAuth app |
+| [Composio](connectors/composio.md) | App discovery and execution through Composio Connect or a configured session. Upstream app authorization happens in Composio; broad execution actions need separate review. Setup is unverified. | Composio Connect sign-in · Configured session URL and headers |
+| [Executor](connectors/executor.md) | One remote endpoint for configured integrations. Agents use its exposed actions within Executor's upstream policies. Setup is unverified. | Deployment URL · Browser sign-in or token/headers |
+| [Fireflies](connectors/fireflies.md) — **Live exception; not yet stable** | Meeting transcripts, summaries, and action items the connected account can access. Setup is unverified. | Sign in with Fireflies · API key |
 | [Jira](connectors/jira.md) | Atlassian's issue tracker for software teams. Agents work with the issues on the Jira site you connect. | Sign in with Jira |
 | [Linear](connectors/linear.md) | Issue tracking for product and engineering teams. Agents create, update, and read issues across whatever the authorizing Linear account can reach. | Your own OAuth app |
 | [Miro](connectors/miro.md) | Shared online whiteboards for diagrams, planning, and workshops. Agents work with the boards your Miro account can reach. | Sign in with Miro |
@@ -92,6 +96,7 @@ Find an app and open its setup guide.
 | [Netlify](connectors/netlify.md) | Hosting and deploys for web front ends. Agents work with the teams and sites your Netlify account can reach. | Sign in with Netlify |
 | [PagerDuty](connectors/pagerduty.md) | On-call scheduling and incident response. Agents work with the incidents, services, and schedules your token can reach. Choose the US or EU service region when you connect. | API key |
 | [Postman](connectors/postman.md) | API development and testing workspace. Agents work with the collections and APIs your Postman account can reach. Choose a toolset: Minimal, Code, or Full. Minimal is not read-only; set action permissions separately. | Sign in with Postman · API key |
+| [Railway](connectors/railway.md) | Infrastructure work in consented workspaces, including service, deployment, and bounded log actions when API access is accepted. Live qualification is pending; container commands require separate SSH setup. | Sign in with Railway |
 | [Sentry](connectors/sentry.md) | Error and performance monitoring. Agents investigate errors, releases, and production issues in the Sentry organization you authorize. | Sign in with Sentry |
 
 ### Data and analytics
@@ -130,6 +135,7 @@ Services whose subject matter is machine learning. They are ordinary app integra
 | --- | --- | --- |
 | [Hugging Face](connectors/hugging-face.md) | Public hub for open machine-learning models, datasets, and demos. Agents search models, datasets, and Spaces. The sign-in asks for a read-only scope, which makes this the shortest connector to try first. | Sign in with Hugging Face |
 | [Mem0](connectors/mem0.md) | Hosted long-term memory for AI applications. Agents store and recall facts across runs in your Mem0 project. | API key |
+| [You.com](connectors/youcom.md) | Hosted web intelligence. The free profile has a reduced read-only tool set; provider limits apply. Setup is unverified. | Sign in with You.com · API key · No credential (free profile) |
 
 ### Model providers