docs: add contributor and security guidelines

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a reproducible problem in Crucix
+title: "[Bug] "
+labels: bug
+assignees: ""
+---
+
+## Summary
+
+Describe the bug clearly.
+
+## Environment
+
+- OS:
+- Install method: local / Docker / other
+- Node version:
+- LLM provider:
+
+## Steps to Reproduce
+
+1.
+2.
+3.
+
+## Expected Behavior
+
+What should have happened?
+
+## Actual Behavior
+
+What happened instead?
+
+## Logs or Screenshots
+
+Paste relevant logs, screenshots, or terminal output.
+
+## Additional Context
+
+Anything else that helps narrow this down.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Security report
+    url: mailto:celesthioailabs@gmail.com
+    about: Report security issues privately instead of opening a public issue.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a feature, source addition, or product improvement
+title: "[Feature] "
+labels: enhancement
+assignees: ""
+---
+
+## Summary
+
+Describe the feature or source you want added.
+
+## Why This Matters
+
+What problem does this solve for Crucix users?
+
+## Scope
+
+- Bug fix:
+- New source:
+- Dashboard/UI change:
+- LLM/provider change:
+- Other:
+
+## Proposed Behavior
+
+Describe the expected behavior or output.
+
+## Maintenance Impact
+
+Note any API keys, rate limits, paid services, dependencies, or ongoing upkeep this would add.
+
+## Additional Context
+
+Links, examples, screenshots, or references.