fix: escalate the symptom phrasing people actually use, and never clear a reported symptom (#21)

Deterministic escalation only fired on a narrow set of literal phrases, so real reports
like "there is blood when I wipe" or "I have tarry stools" reached the chat provider
without the fixed medical guidance. Expanding the suite found 18 of 18 checked clinical
phrasings missing.

- domain: cover bleeding reported by wiping/toilet paper/anatomy/mixed-in phrasing,
  black-tarry-dark-red stool, reported temperature and high temperature, abdominal-scoped
  severe pain in every natural word order, and past-tense/slang inability to pass gas.
  Near-miss wording that must stay quiet (paper cut, blood pressure, black beans, dark red
  wine, a normal temperature, knee or back pain, passed gas, no gas in the car) is pinned.
- domain: a symptom reported in any truthy shape (1, "yes", "true") now counts as reported.
  Reading only the literal boolean `true` silently cleared a symptom, which is the one
  direction this boundary may never fail in.
- hermes-agent-service: the gateway ledger sanitizer used the same strict check, so a
  browser-supplied ledger entry could have its symptom cleared before the escalation check.
- tests/escalation-regression.test.js: per-flag positive and negative language coverage,
  model output can neither set nor clear a symptom/urgency/discomfort/note, and the
  escalation copy is byte-identical for every flag and under a missing, throwing, or
  malicious provider. Registered in the default unit gate.
- scripts/record_release_demo.mjs: the recording now types the new bleeding and tarry
  phrasing, and seeds a fictional ledger whose note says "stool was tarry yesterday", then
  asserts in the browser that exactly one new Timmy bubble carries the app's own copy and
  that the turn never reaches Hermes. Three new captions are required release gates.

Boundary unchanged: no new inference, no diagnosis, no image claim. Escalation only ever
gets broader on user-reported symptoms.

scripts/build_release.py

@@ -37,6 +37,9 @@ DEMO_REQUIRED_CAPTIONS = (
     "Delete all local data clears the ledger in this browser; there is no server copy of it to keep",
     "Hermes Agent connected — free-text, contextual, and server-side",
     "Urgent language is intercepted deterministically before Hermes",
+    "Bleeding reported as wiping still escalates, in the app’s own fixed words",
+    "Tarry and black stool wording escalates too: one red flag, one unchanging message",
+    "A tarry note already saved in the journal escalates the same way, before any provider call",
     "An out-of-range answer fails closed: nothing is applied and no provider detail reaches you",
     "A filled-in field that is out of range still fails closed, even when the other field came back blank",
     "Reachable is not loaded: no AI control, no consent, and no upload until the pinned model is resident",