docs: add SUPPORT.md, CODEOWNERS, and a Q&A discussion template

- SUPPORT.md routes help requests to docs.graphify.com / Discussions /
  Discord, keeps issues for bugs and the security policy for vulns.
- CODEOWNERS sets @safishamsi as default owner with explicit routing for
  the roundtrip-sensitive skillgen paths, workflows, and security/release
  docs (advisory review routing; not a merge gate on its own).
- Q&A discussion template nudges askers to check docs/search first and
  include version + environment.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.github/DISCUSSION_TEMPLATE/q-a.yml

@@ -0,0 +1,34 @@
+labels: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for asking. Before posting, please check the
+        [docs](https://docs.graphify.com) and search existing
+        [discussions](https://github.com/Graphify-Labs/graphify/discussions)
+        and [issues](https://github.com/Graphify-Labs/graphify/issues) — your
+        question may already be answered. For real-time help, join the
+        [Discord](https://discord.gg/XDnKVpzdXB). If you have found a bug, please
+        open an issue instead so it can be tracked.
+  - type: textarea
+    id: question
+    attributes:
+      label: What are you trying to do?
+      description: Describe the goal and the question, not only the error.
+    validations:
+      required: true
+  - type: textarea
+    id: tried
+    attributes:
+      label: What have you tried?
+      description: Commands you ran, docs you read, and what happened.
+    validations:
+      required: false
+  - type: input
+    id: version
+    attributes:
+      label: graphify version and environment
+      description: Output of `graphify --version`, plus your OS and Python version.
+      placeholder: "graphify 0.9.70, macOS 15, Python 3.12"
+    validations:
+      required: false