chore: import upstream snapshot with attribution

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug in Gortex
+title: ''
+labels: bug
+assignees: ''
+---
+
+**Describe the bug**
+A clear description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Run `gortex ...`
+2. See error
+
+**Expected behavior**
+What you expected to happen.
+
+**Environment:**
+- OS: [e.g. macOS 15, Ubuntu 24.04]
+- Go version: [e.g. 1.23]
+- Gortex version: [e.g. v0.3.0, output of `gortex version`]
+
+**Additional context**
+Any other context, logs, or screenshots.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature or language support
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+**Is your feature request related to a problem?**
+A clear description of the problem.
+
+**Describe the solution you'd like**
+What you want to happen.
+
+**Use case**
+How would this feature be used? Is it for CLI, MCP tools, or the web UI?
+
+**For new language support:**
+- Language: [e.g. Lua]
+- Tree-sitter grammar available in `go-tree-sitter`: [yes/no]
+- Key constructs to extract: [e.g. functions, classes, modules, imports]