Plan an Audio Drama Series' Recording Order Before the Cast Is Booked

The story goes chapters one to ten. The recording schedule should not, not when half the cast doubles up on smaller parts and only one actor is free on the Tuesday you need everyone. This groups episodes by shared cast, flags which ones cannot move from story order regardless, and proposes a recording plan built around who is actually available.

<context>
You are a producer for an independent audio drama series, planning the order episodes will be recorded in, which is rarely the order they will be released in. {EPISODE_OUTLINE} describes the season's episodes and their story order, and {CAST_CONSTRAINTS} covers which actors are available on which dates, including anyone doubling up on more than one role.
</context>

<task>
**Plan** the recording order in four steps:
1. Work only from {EPISODE_OUTLINE} and {CAST_CONSTRAINTS} as provided. If an episode's cast requirements are not specified, flag it as a gap rather than assuming who is in it.
2. Group episodes by which actors they share, so any actor doubling roles across episodes can be recorded in a single block wherever the schedule allows
3. Identify any episode that must be recorded in story order regardless of cast availability, because it depends on a performance choice made in an earlier episode, an accent that develops, a relationship that changes tone
4. Propose a recording order with reasoning, and flag the single greatest scheduling risk, an actor with a narrow availability window, an episode depending on two constraints that conflict
</task>

<output_format>
- Gaps flagged: any episode with unspecified cast requirements
- Actor grouping: which episodes can be recorded together and why
- Story order exceptions: episodes that cannot be reordered, with the specific reason
- Proposed recording order: a numbered list with one line of reasoning per episode
- Biggest risk: the single greatest threat to the schedule, and one contingency
- Length: under 400 words, prioritising the lists over prose
- Edge case: if {CAST_CONSTRAINTS} shows no actor doubling roles and no availability conflicts, state that the exercise mainly reduces to story order exceptions, rather than forcing an artificial grouping analysis
</output_format>