[TheGreatAxios]

Closes CL-11846 (https://linear.app/abklabs/issue/CL-11846/keep-caught-errors-in-the-coders-build-tools).

Changes

Every catch in the import scan, package install, posix child, posix sandbox and workflow HTTP JSON reader now binds its error. It handles only the failure it expects and rethrows the rest:

• Import scan: a file that doesn't parse yet (BuildMessage or AggregateError) or is gone (ENOENT) has no imports. A missing, unparsable or wrong-shaped manifest gives no manifest.
• Package install: a missing or unparsable lockfile or manifest is skipped as before.
• Sandbox: a process group that is already gone (ESRCH or EPERM) falls back to killing the child directly. An invalid URL isn't a public host.
• Workflow HTTP JSON reader: a refusal body that isn't a JSON object carries no code.
• Dev-app start: now a named launchDevApp with try/finally instead of an IIFE. Its file-watch restart and page-report reader became named functions, and the ?? [] destructuring default is gone, all with the same behaviour.

Verification

• Lint, format, typecheck and tests pass, and Triage's local check passes all code-pattern rules.

• An independent review found three regressions:

  • a syntax error now throwing from the coder's write tool
  • EPERM from a dead process group on macOS
  • a null refusal body raising a raw TypeError

  All three are fixed. A second review, which probed Bun 1.4.4's actual error types, found the fixes correct and the rewrites behaviour-identical.

[linear-code]

CL-11846

[corbits-triage]

Triage: Pass

No changes needed from you. A maintainer will review this pull request.

Triage will approve.