ci: Add Linters/Automation

.github/CODEOWNERS

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+# Code owners file.
+# This file controls who is tagged for review for any given pull request.
+#
+# For syntax help see:
+# https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
+
+*   @google/a2a-eng

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: 🐞 Bug Report
+description: File a bug report
+title: "[Bug]: "
+type: "Bug"
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for stopping by to let us know something could be better!
+        Private Feedback? Please use this [Google form](https://goo.gle/a2a-feedback)
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: Also tell us what you expected to happen and how to reproduce the issue.
+      placeholder: Tell us what you see!
+      value: "A bug happened!"
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output. This will be automatically formatted into code, so no need for backticks.
+      render: shell
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/google/A2A?tab=coc-ov-file#readme)
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: 💡 Feature Request
+description: Suggest an idea for this repository
+title: "[Feat]: "
+type: "Feature"
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for stopping by to let us know something could be better!
+        Private Feedback? Please use this [Google form](https://goo.gle/a2a-feedback)
+  - type: textarea
+    id: problem
+    attributes:
+      label: Is your feature request related to a problem? Please describe.
+      description: A clear and concise description of what the problem is.
+      placeholder: Ex. I'm always frustrated when [...]
+  - type: textarea
+    id: describe
+    attributes:
+      label: Describe the solution you'd like
+      description: A clear and concise description of what you want to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe alternatives you've considered
+      description: A clear and concise description of any alternative solutions or features you've considered.
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/google/a2a-python?tab=coc-ov-file#readme)
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Thank you for opening a Pull Request!
+Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
+
+- [ ] Follow the [`CONTRIBUTING` Guide](https://github.com/google/a2a-python/blob/main/CONTRIBUTING.md).
+- [ ] Make your Pull Request title in the <https://www.conventionalcommits.org/> specification.
+- [ ] Ensure the tests and linter pass (Run `nox -s format` from the repository root to format)
+- [ ] Appropriate docs were updated (if necessary)
+
+Fixes #<issue_number_goes_here> 🦕

.github/actions/spelling/advice.md

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+<!-- See https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples%3A-advice --> <!-- markdownlint-disable MD033 MD041 -->
+<details><summary>If the flagged items are :exploding_head: false positives</summary>
+
+If items relate to a ...
+
+- binary file (or some other file you wouldn't want to check at all).
+
+  Please add a file path to the `excludes.txt` file matching the containing file.
+
+  File paths are Perl 5 Regular Expressions - you can [test](https://www.regexplanet.com/advanced/perl/) yours before committing to verify it will match your files.
+
+  `^` refers to the file's path from the root of the repository, so `^README\.md$` would exclude `README.md` (on whichever branch you're using).
+
+- well-formed pattern.
+
+  If you can write a [pattern](https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples:-patterns) that would match it,
+  try adding it to the `patterns.txt` file.
+
+  Patterns are Perl 5 Regular Expressions - you can [test](https://www.regexplanet.com/advanced/perl/) yours before committing to verify it will match your lines.
+
+  Note that patterns can't match multiline strings.
+
+</details>
+
+<!-- adoption information-->
+
+:steam_locomotive: If you're seeing this message and your PR is from a branch that doesn't have check-spelling,
+please merge to your PR's base branch to get the version configured for your repository.

.github/actions/spelling/excludes.txt

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+# See https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples:-excludes
+(?:^|/)(?i)COPYRIGHT
+(?:^|/)(?i)LICEN[CS]E
+(?:^|/)(?i)CODE_OF_CONDUCT.md\E$
+(?:^|/)(?i).gitignore\E$
+(?:^|/)3rdparty/
+(?:^|/)go\.sum$
+(?:^|/)package(?:-lock|)\.json$
+(?:^|/)Pipfile$
+(?:^|/)pyproject.toml
+(?:^|/)requirements(?:-dev|-doc|-test|)\.txt$
+(?:^|/)vendor/
+/CODEOWNERS$
+\.a$
+\.ai$
+\.all-contributorsrc$
+\.avi$
+\.bmp$
+\.bz2$
+\.cer$
+\.class$
+\.coveragerc$
+\.crl$
+\.crt$
+\.csr$
+\.dll$
+\.docx?$
+\.drawio$
+\.DS_Store$
+\.eot$
+\.eps$
+\.exe$
+\.gif$
+\.git-blame-ignore-revs$
+\.gitattributes$
+\.gitkeep$
+\.graffle$
+\.gz$
+\.icns$
+\.ico$
+\.jar$
+\.jks$
+\.jpe?g$
+\.key$
+\.lib$
+\.lock$
+\.map$
+\.min\..
+\.mo$
+\.mod$
+\.mp[34]$
+\.o$
+\.ocf$
+\.otf$
+\.p12$
+\.parquet$
+\.pdf$
+\.pem$
+\.pfx$
+\.png$
+\.psd$
+\.pyc$
+\.pylintrc$
+\.qm$
+\.s$
+\.sig$
+\.so$
+\.svgz?$
+\.sys$
+\.tar$
+\.tgz$
+\.tiff?$
+\.ttf$
+\.wav$
+\.webm$
+\.webp$
+\.woff2?$
+\.xcf$
+\.xlsx?$
+\.xpm$
+\.xz$
+\.zip$
+^\.github/actions/spelling/
+^\Q.github/workflows/spelling.yaml\E$
+^\Q.github/workflows/linter.yaml\E$
+\.gitignore\E$
+\.vscode/