forst-lang / forst / 24629274328

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test: improve coverage with runMain and dev HTTP stubs

Extract runMain(argv) int so the CLI is exercised in-process (subprocess tests
do not merge into go test -cover). Replace many os.Exit paths in runMain with
exit codes; restore os.Args around compiler.ParseArgs. StartDevServer and
lsp.StartLSPServer return listen/start errors instead of exiting the process.

DevServer holds a devFunctionExecutor interface (implemented by
*executor.FunctionExecutor) so tests can stub successful invoke, streaming
NDJSON, encode failures, /types discovery errors, and sendJSONResponse errors.
Add fmt/generate edge-case tests, run_main integration tests, and extended
TestMain helper cases.

Example (calling the CLI entry from tests):

```go
if code := runMain([]string{"forst", "build", echoPath}); code != 0 {
	t.Fatalf("exit %d", code)
}
```

40 of 52 new or added lines in 5 files covered. (76.92%)

20890 of 27428 relevant lines covered (76.16%)

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