Local project checks and contribution templates: make check, dependency-free C/python tests, issue forms + blank issues, CONTRIBUTING (#20)

* Add lightweight project checks and templates

* Ignore generated test binaries

* Keep project checks local

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a reproducible defect in Colibri.
+title: "[Bug]: "
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for taking the time to provide a reproducible report.
+  - type: input
+    id: version
+    attributes:
+      label: Commit or version
+      description: Paste the exact commit hash when possible.
+      placeholder: git rev-parse HEAD
+    validations:
+      required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Include OS, CPU, RAM, GPU/CUDA if enabled, compiler, and storage type.
+      placeholder: Ubuntu 24.04, Ryzen 7950X, 64 GB RAM, NVMe, gcc 13
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Reproduction steps
+      description: Include the exact build and run commands with sensitive paths removed.
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual behavior and logs
+      render: shell
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Propose a focused improvement to Colibri.
+title: "[Feature]: "
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What real limitation or workflow problem does this address?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+  - type: textarea
+    id: scope
+    attributes:
+      label: Scope and compatibility
+      description: Note effects on the zero-dependency CPU path, CUDA path, model formats, or platforms.

.github/ISSUE_TEMPLATE/performance_report.yml

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+name: Performance report
+description: Report a benchmark result or performance regression.
+title: "[Performance]: "
+body:
+  - type: input
+    id: commit
+    attributes:
+      label: Commit
+      placeholder: git rev-parse HEAD
+    validations:
+      required: true
+  - type: textarea
+    id: hardware
+    attributes:
+      label: Hardware and storage
+      description: Include CPU, RAM, GPU/VRAM, disk model/type, and filesystem.
+    validations:
+      required: true
+  - type: textarea
+    id: software
+    attributes:
+      label: Software environment
+      description: Include OS, compiler, CUDA/driver versions, and relevant environment variables.
+    validations:
+      required: true
+  - type: textarea
+    id: command
+    attributes:
+      label: Build and benchmark commands
+      render: shell
+    validations:
+      required: true
+  - type: textarea
+    id: results
+    attributes:
+      label: Results
+      description: Include warm-up policy, run count, median tok/s, and profile timings when available.
+      render: text
+    validations:
+      required: true
+  - type: textarea
+    id: comparison
+    attributes:
+      label: Baseline comparison
+      description: For regressions, provide the last known-good commit and its result.

.github/pull_request_template.md

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+## Summary
+
+Describe the problem and the smallest change that solves it.
+
+## Validation
+
+- [ ] `make -C c check`
+- [ ] CUDA changes were tested with `make -C c cuda-test` (if applicable)
+- [ ] Performance claims include hardware, commands, and repeatable measurements
+
+## Compatibility
+
+- [ ] The default CPU build remains dependency-free
+- [ ] No model files, generated binaries, or benchmark artifacts are included