docs: Update documentation to use multiclaude/ branch prefix

[buggtb]

Context

PR #308 standardized worker branch naming from work/ to multiclaude/ prefix in code, but documentation still references the old prefix.

Files to Update

File	Lines	Current	Should Be
docs/CRASH_RECOVERY.md	152, 378	work/<worker-name>	multiclaude/<worker-name>
AGENTS.md	70	work/<worker-name>	multiclaude/<worker-name>
internal/prompts/workspace.md	52	work/clever-fox	multiclaude/clever-fox

Related

• Merged PR: fix: Standardize worker branch naming to multiclaude/ prefix #308
• Original review feedback from @aronchick

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