Get Copilot to explain a terminal failure using the actual run, not the command in isolation

@terminal this command just failed and I want to know why it failed on this specific run, in
this specific environment — not a general explanation of what this command normally does.

COMMAND
npm run build

WHAT ACTUALLY CAME BACK
Module not found: Can't resolve '@/lib/reports/format' in './components/reports/ReportSummary.tsx'

WHAT I EXPECTED INSTEAD
This built successfully yesterday on the same branch with no changes to tsconfig.json or the lib/reports directory.

ENVIRONMENT
Git Bash on Windows 11, Node 20, running inside a pnpm workspace.

WHAT WAS LAST KNOWN TO WORK
Last known good commit is a3f21c9, before a rename of lib/reports/format.ts to lib/reports/formatting.ts.

Answer in this order:
1. Read the actual output above line by line and point to the specific line that indicates the
   real failure — not the last line printed, which is often just the shell's own exit report, but
   the line where the underlying tool first signals something went wrong.
2. State what that specific line means in the context of Git Bash on Windows 11, Node 20, running inside a pnpm workspace., naming the exact
   condition — a missing binary, a permission bit, a wrong working directory, an environment
   variable that is unset or pointing somewhere unexpected — rather than a general category like
   'a configuration issue.'
3. Compare against Last known good commit is a3f21c9, before a rename of lib/reports/format.ts to lib/reports/formatting.ts. and say what is different now that would explain why
   this used to work and does not now, if that information was given — do not skip this step just
   because it requires more inference than restating the error.
4. Propose one command to run next that would confirm your diagnosis before proposing any fix — a
   diagnostic command, not the fix itself, since a fix based on an unconfirmed guess about a
   terminal failure risks masking the real cause instead of resolving it.

Do not suggest reinstalling, clearing a cache, or restarting anything as a first move unless the
output above specifically points there — those are the shotgun fixes that work by accident often
enough to keep getting suggested, and this diagnosis should not default to one.

IF THE SHELL MATTERS
If Git Bash on Windows 11, Node 20, running inside a pnpm workspace. indicates something other than a standard POSIX shell — PowerShell, a
Windows Git Bash session, a shell running inside a container with a different filesystem than the
host — say explicitly whether the failure is specific to that shell's own quoting, path, or
line-ending behavior before assuming the command would behave the same way in a different shell. A
command copied from a POSIX-shell example failing on this run is frequently a shell mismatch, not
a broken command.