Allow plugin containers to propagate env vars

[tleyden]

In yaml config you can define env vars that will be exposed to the plugin container

[coderabbitai]

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[greptile-apps]

Greptile Summary

This PR adds environment-variable propagation for plugin containers. The main changes are:

• Parses string, boolean, numeric, and empty YAML environment values.
• Validates environment-variable names and stores values in plugin configuration.
• Passes configured values to Docker and macOS containers.
• Recreates managed plugin containers to apply configuration updates.
• Adds unit, end-to-end, and documentation coverage.

Confidence Score: 5/5

This looks safe to merge.

Managed containers are recreated with current environment values. Typed YAML scalar values are converted without dropping the plugin entry. No blocking issues found in the changed code.

T-Rex Logs

What T-Rex did

• T-Rex ran the requested verification, but its local artifact references were not uploaded.

_{Ran code and verified through T-Rex}

Important Files Changed

Filename	Overview
crates/platform/src/config/brain3_yaml.rs	Parses and validates plugin environment variables, including typed YAML scalars.
crates/platform/src/container/startup.rs	Propagates environment variables and recreates managed containers to apply current configuration.
crates/core/src/domain/model.rs	Adds environment variables to the plugin container configuration model.
apps/gateway/tests/e2e_smoke.rs	Verifies configured environment values reach a running plugin container.

_{Reviews (2): Last reviewed commit: "add e2e test" | Re-trigger Greptile}