chore(runner): Remove ENV_FILE

[tab]

Rename resolvePaths to resolveServiceDir and drop the .env.development loading

[sentry]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.45%. Comparing base (8381c6b) to head (ca557db).

Files with missing lines	Patch %	Lines
internal/app/runner/service.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
- Coverage   89.45%   89.45%   -0.01%     
==========================================
  Files          63       63              
  Lines        5900     5896       -4     
==========================================
- Hits         5278     5274       -4     
- Misses        488      489       +1     
+ Partials      134      133       -1     

Files with missing lines	Coverage Δ
internal/app/runner/service.go	82.47% <85.71%> (-0.20%)	⬇️

... and 1 file with indirect coverage changes

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[Copilot]

Pull request overview

This PR updates the runner to stop injecting an ENV_FILE environment variable and removes per-service .env.development discovery, aligning service execution with a pure “inherit parent env” model.

Changes:

• Replaced resolvePaths with resolveServiceDir and removed .env.development lookup + ENV_FILE injection in the service start path.
• Centralized the default service command as config.DefaultServiceCommand and adjusted buildCommand + tests accordingly.
• Updated CLAUDE.md to remove .env.development references and document the new environment behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
internal/config/constants.go	Adds DefaultServiceCommand constant for the runner’s default start command.
internal/app/runner/service.go	Removes ENV_FILE injection / .env.development detection; renames path resolver; updates default command handling.
internal/app/runner/service_test.go	Updates buildCommand default expectations to match the new command construction.
CLAUDE.md	Removes outdated .env.development mentions and clarifies env inheritance behavior.

Comments suppressed due to low confidence (1)

internal/app/runner/service.go:628

• buildCommand now always uses sh -c (including the default make run path). This introduces an extra shell process compared to the previous exec.Command("make", "run") behavior, which changes the reported PID/Args and can affect process-tree/termination semantics (the tracked PID becomes the shell, not the direct command). If the goal is only to centralize the default command string, consider keeping the direct exec form for the default case and reserving sh -c for explicitly custom commands (or represent the default as argv instead of a shell string).

// buildCommand creates an exec.Cmd from a command string, falling back to config.DefaultServiceCommand when empty
func buildCommand(command string) *exec.Cmd {
	if command == "" {
		command = config.DefaultServiceCommand
	}

	return exec.Command("sh", "-c", command)
}