wake --model rejects space-separated flag values

[ikma-ricon]

Problem

sessions wake --model=value ... works, but the documented/help shape with a space-separated flag value fails:

sessions wake --headless --model openai-codex/gpt-5.5 --message "Reply ok" <session>

Observed error:

[wake] ERROR unexpected word: openai-codex/gpt-5.5

Equals form works:

sessions wake --headless --model=openai-codex/gpt-5.5 --message "Reply ok" <session>

and launches pi with:

Model: openai-codex/gpt-5.5

Why it matters

The help text advertises:

--model <model>

which implies both common CLI forms should work. The space-separated form is also what agents naturally write after reading --help, and what existing examples tend to show for flags with values.

This came up while trying to run a local sessions wake peer-review with OpenAI (openai-codex/gpt-5.5) because Claude usage was exhausted.

Reproduction sketch

SMOKE_DIR=$(mktemp -d)
SESSION="model-smoke-$(date +%s)"

sessions new "$SESSION" --cwd "$SMOKE_DIR"

# Fails with unexpected word
sessions wake --headless --model openai-codex/gpt-5.5 --message "Reply ok" "$SESSION"

# Works
sessions wake --headless --model=openai-codex/gpt-5.5 --message "Reply ok" "$SESSION"

Acceptance criteria

• sessions wake --model foo <session> parses the same as --model=foo.
• Add a BATS regression test for the space-separated form.
• If the root cause is a usage parser limitation rather than sessions-specific code, document the limitation and update examples/help accordingly.