catalog: add Covision agent plugin

Salvaged from #116529 (org-owned fork, maintainer push denied); contributor map added.

contributors/emails/alimbaydoun@gmail.com

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+alimbaydoun

plugin-catalog/covision.yaml

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+name: covision
+repo: https://github.com/Covision-Consultants/covision-agent-plugin
+sha: 373012bd1b6c31cb2abf38e12e13f10ee2150dcd
+description: >-
+  Read-only Covision meeting, assigned-task, and published-knowledge tools through
+  the Covision Streamable HTTP MCP service, plus a workflow skill. Requires a
+  Covision account, organization connector enablement, and browser OAuth consent;
+  no API key or client secret is stored in the plugin.
+maintainer: Covision Consultants
+tier: community
+category: tools
+docs_url: https://github.com/Covision-Consultants/covision-agent-plugin
+version: "1.0.0"
+platforms: []
+capabilities:
+  provides_tools: []
+  provides_hooks: []
+  provides_middleware: []
+  requires_env: []