feat: add --json flag for test output, env var config, and --version

- Add --json flag to `tools test` for machine-readable CI output
- Support ECTF_TOKEN, ECTF_GIT_URL, ECTF_API_URL env vars for config
- Add --version flag via clap

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Cargo.lock

@@ -226,7 +226,7 @@ dependencies = [
 
 [[package]]
 name = "ectf-tools"
-version = "0.2.0"
+version = "0.3.0"
 dependencies = [
  "anyhow",
  "clap",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ectf-tools"
-version = "0.2.0"
+version = "0.3.0"
 edition = "2024"
 
 [dependencies]