pi-coding-agent 0.70 replaced the mutable \`AgentState.error\` field with
a readonly \`AgentState.errorMessage\`. \`session.prompt()\` still does
not throw when retries are exhausted, so we still need to re-raise the
stored error after each prompt.
- checkSessionError (usage-limit-detector): widen parameter to accept
either key; prefer errorMessage so new sessions work, fall back to
error so we can deploy without forcing everyone's caches to rebuild.
- agent-reflection: same widening at the call site.
- pi.ts helpers: read both keys, best-effort clear both (the new field
is readonly, so the write is a no-op on 0.70 sessions but still
matters for mock sessions in tests).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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