Enhancement: Add PR Templates

.github/PULL_REQUEST_TEMPLATE/bug_fix.md

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+---
+name: Bug Fix
+about: Fix an existing bug in the codebase.
+title: "Fix: <short description>"
+labels: "bug"
+---
+
+## Linked Issue (Required)
+Fixes #
+
+## The Fix
+Explain what the bug was and how you fixed it. Provide details about the changes made to the codebase.
+
+## Verification
+- [ ] `ruff check` passes on my code
+- [ ] `ty check` passes on my code
+- [ ] The bug is reproducible on the `master` branch.
+- [ ] The bug is NO LONGER reproducible on this branch.
+- [ ] All tests in the `tests` directory are passing.

.github/PULL_REQUEST_TEMPLATE/enhancement.md

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+---
+name: Enhancement
+about: Improve existing code or add minor features.
+title: "Enhancement: <short description>"
+labels: "enhancement"
+---
+
+## Linked Issue (Required)
+Closes #
+
+## Summary
+Provide a brief summary of the enhancement being proposed. Include its purpose, key features, and any relevant background information.
+
+## Proposed Changes
+Detail the specific changes you are proposing in this enhancement. Explain how these changes improve the codebase or add new functionality.
+
+## Impact
+- [ ] Performance improvement
+- [ ] Code cleanup / Refactoring
+- [ ] Documentation update
+
+## Breaking Changes
+- [ ] No
+- [ ] Yes (Explain: )
+
+## Checklist
+- [ ] `ruff check` passes on my code
+- [ ] `ty check` passes on my code
+- [ ] My code follows the project's style guidelines
+- [ ] I have updated documentation as needed
+- [ ] I have added tests to cover the new logic

.github/PULL_REQUEST_TEMPLATE/internal.md

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+---
+name: Release / Internal Merge
+about: Merge `dev` -> `master` (Release), `hotfix` -> `master` (Hotfix), or `master` -> `dev` (Sync)
+title: "[<RELEASE TYPE>] <Version # or Description>"
+labels: "internal"
+---
+
+**INTERNAL USE ONLY**
+
+## Release Type
+- [ ] **Release:** Merging `dev` into `master`
+- [ ] **Hotfix:** Merging `hotfix` into `master`
+- [ ] **Sync:** Back-merging `master` into `dev`
+
+## Summary
+A brief description of the changes made in this PR.
+
+## Versioning & Metadata
+- [ ] Bumped version in `pyproject.toml`
+- [ ] Bumped version in `docs/source/conf.py`
+- [ ] Bumped version in `CITATION.cff`
+
+## Post-Merge Reminder
+- [ ] After merging, create a new GitHub Release / Tag matching the version number.

.github/PULL_REQUEST_TEMPLATE/new_model_problem.md

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+---
+name: New Model/Problem
+about: Add a new model/problem to the codebase.
+title: "New Model/Problem: <short description>"
+labels: "enhancement"
+---
+
+## Linked Issue (Optional)
+Closes #
+
+## Model/Problem Overview
+Provide a brief overview of the new model/problem being added. Include its purpose, key features, and any relevant background information.
+
+## Gap Analysis
+Describe the gaps in existing models/problems that this new model/problem addresses. Explain why this model/problem is necessary and how it improves upon or complements existing solutions.
+
+## Checklist
+- [ ] `ruff check` passes on my code
+- [ ] `ty check` passes on my code
+- [ ] I have included model/problem documentation in `docs/source/models/` based on the `model_template.rst` file and confirmed the documentation builds without warnings/errors
+- [ ] I have included results generated via the `scripts/generate_experiment_results.py` script

.github/PULL_REQUEST_TEMPLATE/new_solver.md

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+---
+name: New Solver
+about: Add a new solver to the codebase.
+title: "New Solver: <short description>"
+labels: "enhancement"
+---
+
+## Linked Issue (Optional)
+Closes #
+
+## Solver Overview
+Provide a brief overview of the new solver being added. Include its purpose, key features, and any relevant background information.
+
+## Gap Analysis
+Describe the gaps in existing solvers that this new solver addresses. Explain why this solver is necessary and how it improves upon or complements existing solutions.
+
+## Checklist
+- [ ] `ruff check` passes on my code
+- [ ] `ty check` passes on my code
+- [ ] I have included solver documentation in `docs/source/solvers/` based on the `solver_template.rst` file and confirmed the documentation builds without warnings/errors
+- [ ] I have included results generated via the `scripts/generate_experiment_results.py` script

.github/pull_request_template.md

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+Please go to the `Preview` tab and select the appropriate sub-template:
+
+* [Bug Fix](?expand=1&template=bug_fix.md)
+* [Enhancement](?expand=1&template=enhancement.md)
+* [New Model/Problem](?expand=1&template=new_model_problem.md)
+* [New Solver](?expand=1&template=new_solver.md)
+* [Release/Internal Merge (Internal Use Only)](?expand=1&template=internal.md)