Add .agents/environment.yaml for automated dev setup

[devin-ai-integration]

Summary

Adds a .agents/environment.yaml configuration file so that future Devin sessions can automatically set up this repo for local development. The config was created after manually verifying the full setup process:

• Node 8 is required (Angular 5.x era project) and is installed via nvm
• The website directory is the main runnable Angular Contacts app — confirmed it builds and serves successfully on port 4200
• Dependency installation is configured for website, chapter08, chapter09, and chapter11 (the chapters exercised by CI)
• Knowledge entries document how to lint, test, and start the app

Not included in maintenance installs: chapter06/chapter07 (pre-existing build errors from Angular Material API changes) and chapter10 sub-projects.

Review & Testing Checklist for Human

• Verify chapter10 sub-projects should be excluded from maintenance installs — CI does run tests in chapter10/test_capabilities, chapter10/test_multicapabilities, and chapter10/test_plugins, but they are not included in the maintenance step. Consider whether they should be added.
• Confirm Node 8 via nvm is acceptable — Node 8 is EOL; verify this remains available in target environments.
• Test the lint/test knowledge entries — these were documented but not fully verified during the session (ng lint and ng test --watch=false for the website app). Worth confirming they work with the current dependencies.

Notes

• Devin Session
• Requested by: @Joseph-Gross

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[devin-ai-integration]

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[devin-ai-integration]

Devin Review found 1 potential issue.

View 1 additional finding in Devin Review.

[devin-ai-integration]

🟡 Maintenance step missing chapter10 dependency installation that CI requires

The maintenance section installs dependencies for chapter08, chapter09, and chapter11, but omits chapter10 subdirectories. The CI config at .circleci/config.yml installs and runs tests for chapter10/test_capabilities, chapter10/test_multicapabilities, and chapter10/test_plugins. The notes section at line 41 even acknowledges this: "CI runs on chapter08, chapter09, chapter10/*, and chapter11", yet the maintenance step doesn't install any chapter10 dependencies, so any Devin task involving chapter10 e2e tests will fail.

Suggested change

	# Install dependencies for chapter projects used in CI
	(cd chapter08 && npm install)
	(cd chapter09 && npm install)
	(cd chapter11 && npm install)
	(cd chapter08 && npm install)
	(cd chapter09 && npm install)
	(cd chapter10/test_capabilities && npm install)
	(cd chapter10/test_multicapabilities && npm install)
	(cd chapter10/test_plugins && npm install)
	(cd chapter11 && npm install)

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