v1.1.2 — Response-shape fuzz + property-testing hardening

[1.1.2] - 2026-07-03

Fixed — deep-audit round 3: response-shape fuzz + property-based testing

Round 2 fuzzed tool INPUTS; round 3 fuzzed what CallRail sends BACK
(2,891 calls with structurally-valid-but-garbage-typed responses) and
brought hypothesis property testing to invariants no prior round had
mechanically verified.

Response-shape hardening (182 fuzz failures, 8 roots)

• paginate() now yields only dict items. A malformed collection
  containing strings/ints/nulls crashed all six paginate-consuming
  tools (call_summary, usage_summary, compare_periods,
  spam_detector, search_calls_by_number, bulk_update_calls) with
  raw AttributeError on item.get(). Non-dict items are skipped with
  a warning.
• call_eligibility_check — wrong-typed utm_source/source/
  source_name crashed .lower(); now safely coerced.
• search_calls_by_number — non-string customer_phone_number in
  a call record crashed _digits_only; now skipped.

Hypothesis findings (property-based, permanent in

tests/test_properties.py)

• _date_window OverflowError — reachable in production. A
  valid-format ancient end_date (e.g. "0001-01-01") minus a large
  days lookback lands before year 1, which date cannot represent —
  list_calls(days=36500, end_date="0001-01-01") crashed with a raw
  OverflowError despite the 36500-day cap. Now clamped to date.min.
• Money invariant now machine-verified: per-company cost shares in
  usage_summary sum to estimated_cycle_total exactly (cent-level)
  across 120 randomized fleets per run.
• Also pinned: _safe_path can never emit a dot-segment or unencoded
  reserved char for ANY input; _parse_retry_after always lands in
  [0, 60] and finite; _is_toll_free and _date_window are total
  functions over garbage.

Added — tests

• tests/test_properties.py — 6 hypothesis property suites.
• 4 targeted regressions (ancient end_date, paginate non-dict skip,
  wrong-typed eligibility fields, non-string phone field).
• Tests 385 → 395.