Add repository governance and contribution standards

.github/CODEOWNERS

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+* @CameronImmesoete

.github/copilot-instructions.md

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+# Copilot Instructions
+
+> Base instructions: [CameronImmesoete/.github/.github/copilot-instructions.md@1f79bfb](https://github.com/CameronImmesoete/.github/blob/1f79bfb3e9eee277d05ecdd3332220204cb0f38b/.github/copilot-instructions.md)
+
+## Repository-Specific Guidelines
+
+This is a Pascal's triangle generator in Python.
+
+- Algorithmic correctness is the priority (binomial coefficient math)
+- Handle edge cases: row 0, negative inputs, very large row numbers
+- Integer overflow considerations for large rows
+- Output formatting should be consistent and readable
+- This is a single-file project; keep it simple and self-contained

.github/copilot-review-skill.md

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+# Code Review Standards
+
+> Base review standards: [CameronImmesoete/.github/.github/copilot-review-skill.md@1f79bfb](https://github.com/CameronImmesoete/.github/blob/1f79bfb3e9eee277d05ecdd3332220204cb0f38b/.github/copilot-review-skill.md)
+
+## Repository-Specific Review Criteria
+
+### Algorithm Correctness
+- Pascal's triangle values match binomial coefficients
+- Each row sum equals 2^n
+- Symmetry property: C(n,k) = C(n,n-k)
+- Edge values are always 1
+
+### Edge Cases
+- Row 0 returns [1]
+- Negative row numbers rejected with clear error
+- Large row numbers: integer overflow handling
+- Input validation (non-negative integers only)

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
+
+      - name: Lint
+        run: uvx ruff check .
+
+      - name: Format check
+        run: uvx ruff format --check .
+
+      - name: Syntax check
+        run: python -c "import py_compile; py_compile.compile('pascal.py', doraise=True)"

.gitignore

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+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.egg-info/
+dist/
+build/
+*.egg
+.eggs/
+*.whl
+
+# Virtual environments
+.venv/
+venv/
+ENV/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.project
+.settings/
+
+# OS
+.DS_Store
+Thumbs.db
+Desktop.ini
+
+# Testing / Coverage
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+htmlcov/
+.coverage
+coverage.xml
+
+# Secrets
+.env
+.env.*
+*.pem
+*.key

AGENTS.md

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+# Agent Guidelines
+
+## PR Rules
+- One PR per branch. One branch per task.
+- Never close a PR to open a replacement. Fix in place.
+- Never push directly to main.
+- Squash merge only.
+- Branches auto-delete after merge.
+- Branch naming: `user/CameronImmesoete/<description>`
+
+## CI Requirements
+- All CI checks must pass before merge.
+- No `[skip ci]` commits unless pure documentation.
+- If CI is red on main, fix it before other work.
+
+## Security
+- Never commit secrets, API keys, tokens, or credentials.
+- Never add dependencies without justification.
+- Never force push to main.
+- Run tests before pushing.
+
+## Code Quality
+- Tests required for all new functions.
+- Lint must pass (ruff for Python, eslint for TypeScript).
+- Type checks must pass (mypy for Python, tsc for TypeScript).
+- Prefer simple, readable code over clever abstractions.
+
+## Shared Workflows
+- Python repos can use the reusable CI workflow: `uses: CameronImmesoete/.github/.github/workflows/python-ci.yml@main`
+  - Note: The doubled `.github` is intentional. The first is the repo name (`CameronImmesoete/.github`), the second is the workflows directory within it (`.github/workflows/`).
+- **Pinning policy:** `@main` is temporary during initial setup. Once the shared workflow repo has a stable first release, all callers must pin to a tagged release or specific commit SHA (e.g., `@v1.0.0` or `@abc1234`). Never use `@main` in production workflows. Update callers when the shared workflow changes by bumping the pinned reference.

CONTRIBUTING.md

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+# Contributing
+
+Solo project maintained by [Cam Immesoete](https://github.com/CameronImmesoete). External contributions are not accepted at this time.
+
+## Standards
+
+- All changes go through pull requests (no direct pushes to main)
+- Clean, descriptive commit messages
+- No secrets, credentials, or API keys in code

LICENSE

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+MIT License
+
+Copyright (c) 2024 Cam Immesoete
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

pascal.py

@@ -1,5 +1,6 @@
 # Retrying the Pascal problem
 
+
 def PascalNChooseK(n, k):
   if n < 0 or k < 0 or k > n:
     return "Invalid"
@@ -8,6 +9,7 @@ def PascalNChooseK(n, k):
     return halfrow[k]
   return halfrow[n - k]
 
+
 def PascalHelper(n):
   current = [1]
   last = [1]
@@ -20,11 +22,20 @@ def PascalHelper(n):
       current += [last[len(last) - 1] * 2]
   return current
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
   print("N Choose K tests:")
   print("5 choose 2: " + str(PascalNChooseK(5, 2)))
   print("5 choose 3: " + str(PascalNChooseK(5, 3)))
   print("5 choose 6: " + str(PascalNChooseK(5, 3)))
-  print("15 choose 4: " + str(PascalNChooseK(15, 4)) + " # if n > 13, factorial method would blow up")
-  print("40 choose 30: " + str(PascalNChooseK(40, 30)) + " # if n > 13, factorial method would blow up")
-  print("0 choose 0: " + str(PascalNChooseK(0, 0)))
+  print(
+    "15 choose 4: "
+    + str(PascalNChooseK(15, 4))
+    + " # if n > 13, factorial method would blow up"
+  )
+  print(
+    "40 choose 30: "
+    + str(PascalNChooseK(40, 30))
+    + " # if n > 13, factorial method would blow up"
+  )
+  print("0 choose 0: " + str(PascalNChooseK(0, 0)))

ruff.toml

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+# Ruff configuration for Pascal repo
+# Preserve existing code style
+
+indent-width = 2
+
+[lint]
+# Ignore naming convention rules (PascalCase function names are intentional)
+ignore = ["N802", "N803"]