Docker dev server doesn't receive environment variables from .env files

[acreeger]

Problem

When using Docker-based dev servers (devServer: 'docker'), environment variables from .env files are not passed into the container. This means any dev server that depends on environment variables (e.g., DATABASE_URL, API_KEY) will fail to start or behave correctly in Docker mode.

Root Cause

There are two related gaps:

1. il open / il run never load .env files

ensureServerRunning() in DevServerManager doesn't accept or pass envOverrides. Neither open.ts nor run.ts call loadWorkspaceEnv() — they only use getWorkspacePort() for port calculation.

• In native mode, this accidentally works because the child process inherits process.env from the host shell (which may include sourced .env vars)
• In Docker mode, this completely fails — containers are isolated and only receive explicitly passed -e flags

2. Docker strategy has no .env file mechanism

startDockerServer() calls runContainerDetached() without any envOverrides. The container only receives PORT. There is no --env-file flag or .env volume mount.

What works today

il dev-server <issue> (foreground mode) correctly loads .env files via loadWorkspaceEnv() and passes them as envOverrides — this works in both native and Docker modes.

Suggested fix

1. Add envOverrides parameter to DevServerManager.ensureServerRunning() and plumb it through to startDockerServer() → runContainerDetached()
2. Have open.ts and run.ts call loadWorkspaceEnv() (when sourceEnvOnStart is enabled) and pass the result through
3. Consider also supporting Docker's --env-file flag as an alternative/complement to individual -e flags

Affected code paths

• src/lib/DevServerManager.ts — ensureServerRunning(), startDockerServer()
• src/lib/DockerDevServerStrategy.ts — runContainerDetached()
• src/commands/open.ts — ensureServerRunning() call
• src/commands/run.ts — ensureServerRunning() call
• src/utils/env.ts — loadWorkspaceEnv()