chore: add issue templates and CONTRIBUTING guide

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a problem with the FireSight map or data
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        FireSight runs entirely in the browser against live NASA FIRMS feeds.
+        Because the data is live, please note roughly when you saw the issue and
+        which feed was involved — a hotspot that's gone by tomorrow is hard to
+        chase down later.
+  - type: textarea
+    id: summary
+    attributes:
+      label: What happened?
+      description: Expected versus actual. A screenshot of the map helps a lot.
+    validations:
+      required: true
+  - type: dropdown
+    id: where
+    attributes:
+      label: Where did you see it?
+      options:
+        - Local (`python3 -m http.server`)
+        - Deployed site (Netlify)
+    validations:
+      required: true
+  - type: dropdown
+    id: feed
+    attributes:
+      label: Which data feed?
+      options:
+        - MODIS C6.1
+        - VIIRS NOAA-20 C2
+        - Both / not sure
+        - Not data-related (UI / map)
+    validations:
+      required: true
+  - type: input
+    id: env
+    attributes:
+      label: Browser and OS
+      placeholder: "Firefox 130 on Windows 11"
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an improvement to FireSight
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem / motivation
+      description: What would make FireSight more useful for exploring current fire activity?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: What you'd like. Note if it would add a build step or an API key — the app is deliberately zero-setup.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+    validations:
+      required: false

CONTRIBUTING.md

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+# Contributing to FireSight
+
+FireSight is a static browser app (Leaflet + vanilla JS) with optional Python
+helper scripts. There's no build step and no API key.
+
+## Setup
+
+```bash
+git clone https://github.com/zelinewang/FireSight.git
+cd FireSight
+python3 -m http.server 8000
+# open http://localhost:8000/src/ and click "Update"
+```
+
+## Checks
+
+CI runs exactly two checks — please run them before pushing:
+
+```bash
+node --check src/app.js             # browser JS syntax
+python3 -m py_compile scripts/*.py  # Python helper syntax
+```
+
+The `scripts/` helpers are optional/offline and are not loaded by the web app;
+please keep that separation.
+
+## Pull requests
+
+- Branch off `main`; open one focused PR per change.
+- Conventional-ish commit subjects (`fix:`, `feat:`, `docs:`…). PRs are
+  squash-merged.
+- The app must keep working with no build and no key — don't add a required
+  bundler or server dependency for a client-side change.
+
+## License
+
+By contributing, you agree that your contributions are licensed under the
+project's [MIT License](LICENSE).