Add issue templates, CONTRIBUTING.md, and code of conduct

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a problem with NotAlterra
+title: ''
+labels: bug
+assignees: ''
+---
+
+**Describe the bug**
+What happened and what did you expect to happen?
+
+**Steps to reproduce**
+1. 
+2. 
+3. 
+
+**Environment**
+- OS: (e.g. Windows 11, Ubuntu 24.04)
+- NotAlterra version: (shown in the title bar)
+- Subnautica 2 install: (Steam, Xbox, Epic, custom)
+
+**Logs**
+If available, attach `transaction.log` (located next to the binary).

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an improvement for NotAlterra
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+**What problem would this solve?**
+A clear description of the pain point.
+
+**Proposed solution**
+What would you like NotAlterra to do?
+
+**Alternatives considered**
+Any workarounds or alternative approaches you've tried.
+
+**Additional context**
+Screenshots, references to other save managers, or anything relevant.

CONTRIBUTING.md

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+# Contributing to NotAlterra
+
+Thanks for considering a contribution.  NotAlterra is maintained by a single
+developer and every improvement — code, documentation, design, or testing —
+is appreciated.
+
+## Getting Started
+
+1. **Fork** the repository and clone it locally.
+2. **Build** with `cargo build`.
+3. **Run the test suite** with `cargo test`.
+4. **Read the docs** at [https://forkless.github.io/NotAlterra/notalterra/](https://forkless.github.io/NotAlterra/notalterra/).
+
+## Making Changes
+
+- Work on a **feature branch** from `master`.
+- Keep changes focused — one logical change per pull request.
+- Write or update **inline documentation** for any new or modified function.
+  The check script `python3 tests/_check.py` enforces 100% doc coverage.
+- Add **tests** for new behaviour.  Integration tests live in `tests/`,
+  unit tests are inline in `src/`.
+- Run `cargo fmt` before committing if you have `rustfmt` installed.
+
+## Commit Convention
+
+Commits should be atomic and descriptive.  No strict format required, but
+clear messages help reviewers.  Example:
+
+```
+Add timeout to save-folder discovery scan
+
+The scan can hang on slow network shares.  Added a
+5-second per-drive timeout with a warning to the user.
+```
+
+## Pull Requests
+
+1. Push your branch and open a PR against `master`.
+2. GitHub Actions will run checks and tests automatically.
+3. A maintainer will review within a few days.
+4. All PRs must pass CI before merging.
+
+## Code of Conduct
+
+Be respectful.  Be constructive.  Assume good intent.
+
+NotAlterra is a small project built by someone learning as they go.
+Questions are welcome, patience is appreciated, and kindness is
+non-negotiable.
+
+## AI-Assisted Contributions
+
+NotAlterra uses agentic AI tools in its development process.  If you use AI
+assistance in your contribution:
+
+- **Review everything** the AI generates before submitting.
+- **Do not** submit AI-generated changes you do not understand.
+- **Disclose** significant AI usage in your PR description.
+- The same quality standards apply regardless of how code is generated.
+
+## Need Help?
+
+Open a [discussion](https://github.com/forkless/NotAlterra/discussions) or
+file an issue with the "question" label.  No question is too basic.