chore: add editorconfig, issue templates, and dependabot

.editorconfig

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+# https://editorconfig.org
+# Mirrors the line-ending normalization from .gitattributes.
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[*.{yml,yaml}]
+indent_size = 2
+
+# Markdown uses trailing spaces for hard line breaks.
+[*.md]
+trim_trailing_whitespace = false
+
+# Make requires real tabs.
+[Makefile]
+indent_style = tab

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a problem with MoonProto
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to file a report. Please fill in the details below.
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: "The `moonproto` crate version, or the git commit SHA."
+      placeholder: "commit sha"
+    validations:
+      required: true
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating system
+      options:
+        - Windows
+        - macOS
+        - Linux
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+    validations:
+      required: true
+  - type: textarea
+    id: behavior
+    attributes:
+      label: Expected vs. actual behavior
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs
+      description: Relevant log output, error messages, or backtraces.
+      render: text
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Moonbot
+    url: https://moonbot.pro
+    about: Product information and the Moonbot kernel.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an idea or improvement for MoonProto
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem or motivation
+      description: What are you trying to do, and what gets in the way?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+    validations:
+      required: false

.github/dependabot.yml

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+version: 2
+updates:
+  # Keep Cargo dependencies up to date.
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "deps"