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fix: cancel command context on SIGINT and SIGTERM (#234)

* feat(cli): add exit codes for interrupted commands

A signal ends ochami through Go's default disposition today, so the
shell reports 130 for SIGINT and 143 for SIGTERM. Once the root command
cancels its context on those signals instead, the cancellation reaches
commands as an ordinary error, usually already coded (a request error
classified as CodeNetwork, or a prompt failure as CodeGeneric), and the
process would exit with that code.

Add CodeInterrupted (130) and CodeTerminated (143) to the exit code
contract so scripts keep seeing the statuses they see now, and document
them in ochami(1)'s EXIT STATUS table, which the conventions check
compares against CodeName.

Add InterruptError, the cancel cause that carries the signal, and
Interrupted, which replaces a cancellation error with that cause coded
with the signal's exit code. Mapping the code in one place keeps the
many commands that wrap request errors from each needing to recognize
cancellation.

Signed-off-by: Devon Bautista <17506592+synackd@users.noreply.github.com>

* fix(cli): cancel prompts and stdin reads with the command context

Confirmation prompts and stdin payload reads block in a Read of stdin
that nothing can interrupt: LoopYesNo scans until a line or end of
input, and the payload helpers read "-d @-" and stdin payloads to end
of input. Once Ctrl+C cancels the command's context instead of killing
the process, those reads would ignore it and Ctrl+C would appear to do
nothing.

Add IOStreams.InContext, a reader of stdin whose reads return ctx.Err()
once the context is done. Each underlying Read runs in a goroutine into
a private buffer, so an abandoned Read never writes into the caller's
memory, and its result is handed to the next Read so no input is lost.
It reads lazily, so payloads passed inline still never touch stdin.

LoopYesNo, ConfirmCreate, and Runtime.AskToCreate now take a context
and read through it. A cancelled... (continued)

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