chore: add coc, contibution, and security documents for community guidelines

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug or unexpected behavior
+title: "[bug]: "
+labels: ["bug", "triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        thanks for taking the time to fill out this bug report!
+        please provide as much detail as possible to help us investigate.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear description of what the bug is.
+      placeholder: What happened? What did you expect to happen?
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to Reproduce
+      description: How can we reproduce this issue?
+      placeholder: |
+        1. run `snitch ...`
+        2. press '...'
+        3. see error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: false
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      description: What actually happened? Include any error messages.
+    validations:
+      required: false
+
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: What version of snitch are you running? (`snitch version`)
+      placeholder: "v0.1.0"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating System
+      options:
+        - Linux
+        - macOS
+        - Other
+    validations:
+      required: true
+
+  - type: input
+    id: os-version
+    attributes:
+      label: OS Version
+      description: e.g., Ubuntu 22.04, macOS 14.1, Arch Linux
+      placeholder: "Ubuntu 22.04"
+    validations:
+      required: false
+
+  - type: dropdown
+    id: install-method
+    attributes:
+      label: Installation Method
+      options:
+        - Homebrew
+        - go install
+        - Nix/NixOS
+        - AUR
+        - Binary download
+        - Install script
+        - Other
+    validations:
+      required: false
+
+  - type: textarea
+    id: config
+    attributes:
+      label: Configuration
+      description: Paste your `~/.config/snitch/snitch.toml` if relevant (optional)
+      render: toml
+    validations:
+      required: false
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs / Terminal Output
+      description: Paste any relevant terminal output or error messages
+      render: text
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Any other context about the problem? Screenshots, related issues, etc.
+    validations:
+      required: false
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Question / Discussion
+    url: https://github.com/karol-broda/snitch/discussions
+    about: Ask questions, share ideas, or discuss snitch usage
+  - name: Documentation
+    url: https://github.com/karol-broda/snitch#readme
+    about: Check the README for usage and configuration docs
+

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement
+title: "[feature]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        thanks for suggesting a feature! please describe your idea clearly.
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem / Use Case
+      description: What problem does this solve? What are you trying to accomplish?
+      placeholder: I'm always frustrated when...
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe your proposed solution or feature
+      placeholder: I would like snitch to...
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Have you considered any alternative solutions or workarounds?
+    validations:
+      required: false
+
+  - type: dropdown
+    id: area
+    attributes:
+      label: Area
+      description: What part of snitch does this affect?
+      options:
+        - TUI (interactive mode)
+        - CLI output (ls, json, watch)
+        - Filtering / Sorting
+        - DNS resolution
+        - Configuration
+        - Installation / Packaging
+        - Documentation
+        - Other
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Any other context, mockups, or screenshots about the feature request
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: contribution
+    attributes:
+      label: Contribution
+      description: Would you be interested in contributing this feature?
+      options:
+        - label: I'd be willing to submit a PR for this feature
+

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- describe what this PR does -->
+
+## Related Issues
+
+<!-- link any related issues: fixes #123, closes #456 -->
+
+## Type of Change
+
+- [ ] bug fix
+- [ ] new feature
+- [ ] breaking change
+- [ ] documentation
+- [ ] refactoring
+- [ ] other: <!-- describe -->
+
+## AI Disclosure
+
+<!-- required: select one -->
+
+- [ ] `ai: none` — no ai assistance used
+- [ ] `ai: assisted` — ai helped with portions (describe below)
+- [ ] `ai: generated` — significant portions were ai-generated (describe below)
+
+<!-- if ai-assisted or ai-generated, briefly describe what was ai-generated: -->
+
+## Checklist
+
+- [ ] i have tested these changes locally
+- [ ] i have run `make test` and all tests pass
+- [ ] i have run `make lint` and fixed any issues
+- [ ] i have updated documentation if needed
+- [ ] my code follows the existing style of the project
+
+## Screenshots / Terminal Output
+
+<!-- if applicable, add screenshots or terminal output showing the change -->
+