feat: admit agent development environments; add Orca and Paseo

Criterion 1 previously excluded "workspaces for agents", which ruled out
the ADE category entirely. ADEs are the surface a developer actually works
in, the same way a coding agent is, so they now qualify on their own terms.
Libraries, SDKs, skill collections and observability-only layers stay out.

- Widen inclusion criterion 1 in templates/readme.tmpl and document the
  two admitted kinds in docs/CONTRIBUTING.md.
- Add `orchestration` to the Workflow facet in validate.go so ADEs are
  filterable as a distinct class on the dashboard.
- Add stablyai/orca (70.0k) and getpaseo/paseo (17.5k).

README.md is regenerated from the template by the daily run; its
Contributing section is updated here so it is not stale in the meantime.

go run . -check: 43 agents valid. go test ./...: ok.

data/agents.yml

@@ -143,3 +143,11 @@ agents:
     repo: Orkas
     tags: [desktop, byo-model, interactive, community]
     notes: "Open-source, local-first desktop AI workforce coordinated by a Commander through one chat; supports local coding-agent workflows."
+  - owner: stablyai
+    repo: orca
+    tags: [desktop, terminal, byo-model, orchestration, headless, community]
+    notes: "ADE: runs Codex, Claude Code, OpenCode and Pi side-by-side, each in its own git worktree, with a mobile companion app."
+  - owner: getpaseo
+    repo: paseo
+    tags: [desktop, web, terminal, self-hosted, byo-model, orchestration, headless, community]
+    notes: "ADE: self-hosted daemon that runs Claude Code, Codex, Copilot, OpenCode and Pi on your own machines, driven from desktop, mobile, web or CLI."