Suriyakumarvijayanayagam 5159c8d1a7 fix(dispatch): presence is three-state — absent status key is unknown, not off-duty ...

The previous commit treated a missing miler_status:<id> key as "not available".
In production only 2 of 34 milers have that key at all, so the agent would have
reported "no available rider" for nearly every failure — a confident wrong
answer in the opposite direction from the bug it fixed.

- _miler_presence returns available / unavailable / unknown. No key, an
  unparseable value, or an unrecognised status reads as unknown.
- _find_zone prefers a confirmed-available miler, otherwise reports the nearest
  unknown-presence one (it may well be assignable), and returns None only when
  every nearby candidate is confirmed off duty.
- Facts carry nearest_miler_within_km + nearest_miler_presence; the prompt
  states plainly that unknown presence is not evidence of a coverage gap and
  should lean to monitor/escalate rather than ops_alert.
- New eval case for riders-nearby-but-no-presence-data; tests for all three
  presence states.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012AJLYcbTHCe45fyFnMfEin

2026-09-22 16:39:33 +05:30

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