becwright init should detect Go and Rust

[DataDave-Dev]

Context

becwright init auto-detects languages and scaffolds starter rules, but src/becwright/cli.py only recognizes Python/JS/TS — _EXT_LANG and _starter_rules were never updated after the Go/Rust catalog BECs landed (#15). A pure Go or Rust repo currently gets rules: [].

Proposal

• Add .go → go and .rs → rust to _EXT_LANG.
• Add Go/Rust starter rules in _starter_rules, mirroring becs/no-debug-go.bec.yaml / becs/no-debug-rust.bec.yaml, e.g.:
  • Go: becwright run forbid --pattern 'fmt\.Println\s*\(|panic\s*\('
  • Rust: becwright run forbid --pattern 'dbg!\s*\(|println!\s*\('

Acceptance criteria

• A repo with .go/.rs files yields matching starter rules.
• Tests added next to the existing ones in tests/test_init.py (test_starter_rules_*, test_detect_languages_*).

Files: src/becwright/cli.py (_EXT_LANG, _detect_languages, _starter_rules).

[sarkarshrayan2-max]

Hi, I would like to work on this issue. I will add Go and Rust detection to becwright init, include the relevant starter rules, and add focused tests in tests/test_init.py.

[DataDave-Dev]

Hi @sarkarshrayan2-max — thanks for offering, that'd be great! Go ahead and take it. 🙌

A few pointers so it lands smoothly:

• Mirror the existing catalog BECs: becs/no-debug-go.bec.yaml and becs/no-debug-rust.bec.yaml for the patterns, so init stays consistent with what's already importable.
• Touch points are all in src/becwright/cli.py: _EXT_LANG (.go → go, .rs → rust), _detect_languages, and _starter_rules.
• Please add tests next to the existing ones in tests/test_init.py (test_starter_rules_*, test_detect_languages_*) covering a pure-Go and a pure-Rust repo.
• Keep the rules' intent / why_it_matters filled in (that's the whole point of a BEC), and use severity: warning for debug-remnant style rules unless there's a reason to block.

Open the PR against main and the CI + becwright's own pre-commit will run. Ping here if anything's unclear!