fix(cli): reject unrecognized flags instead of treating them as issue ids (#2)

[bougyman]

issue list/take/update all set allow_unknown_args: true so bare tokens
(e.g. CRY-1) can be captured as issue ids via result.unknown - Optimus
has no type: :array equivalent for positional args. That same bucket
also silently swallowed any unrecognized flag (a typo, or a real flag
the subcommand just doesn't have, like --mine on issue list), which
then got looked up as a literal issue id instead of erroring - a raw
%Ash.Error.Unknown{} dump reaching the user.

run/3 now filters result.unknown for anything flag-shaped before ever
calling the command, returning a clean {:smells_bad, "unrecognized
option(s): ..."} (exit 22) instead. Every other subcommand already has
this covered by Optimus's own parser (allow_unknown_args: false
rejects unknown args before we ever see a parse_result), so this only
ever fires for the three subcommands that needed the escape hatch.

Per the issue: --mine itself is intentionally not being added -
--no-mine already covers it (--mine is the implied default).

[Copilot]

Pull request overview

This PR improves linear-cli’s handling of subcommands that enable allow_unknown_args: true (to capture bare issue IDs) by rejecting flag-shaped unknown tokens up front, preventing typos/unimplemented flags from being interpreted as issue identifiers and causing confusing Ash error dumps.

Changes:

• Added reject_unknown_flags/1 gating in run/3 to turn unknown -/---prefixed tokens into a clean {:smells_bad, "unrecognized option(s): ..."} error (exit 22) before any command/API call.
• Added an ExUnit regression test ensuring issue list --mine errors clearly instead of being treated as an issue id.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
app/lib/linear_cli/cli.ex	Filters result.unknown for flag-shaped tokens and routes them through the existing :smells_bad error handling (exit 22).
app/test/linear_cli/cli_test.exs	Adds regression coverage for the issue list --mine case to ensure a clear, user-facing error.

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