news: DeepSeek validation, vs_forecast fix, /status source health

Validation (llm_news_eval.py harness + 78-headline golden CSV + verdict
doc): headline scoring 78/78 vs keyword baseline 24/78 — validated;
event gold-direction calls misread close K/M numeric comparisons ~11%
of the time (both claims cases in sample, JOLTS 8.79M vs 8.84M).

Fix: event payload now carries code-computed "vs_forecast" (from
EconomicEvent.surprise) and the prompt gains an explicit inverted-
metrics rule + worked claims example — iteration 1 (field alone) fixed
the arithmetic but exposed a masked inversion error. 18/18 on live
re-verification (4 misreads fixed, 11 regression cases clean, 3 fresh
both-side probes).

/status: new "News & AI" section — per-source health for the calendar
chain (which of FF/MyFXBook served), each RSS feed, and DeepSeek
(daily count, last error kind), written passively by the existing
fetch paths under _cache_lock. Failures WARN once on transition
(repeats DEBUG, recovery INFO) so the rotating log carries outage
stories without 10-min spam.

test_all.py: +5 Module 19 tests (351 total); also carries the Module 22
fixed-RR-TP tests from the prior research session (shared file).
Replay artifacts dir gitignored like commit_ladder.

Claude-Session: https://claude.ai/code/session_017mbXs9HRawZhD1uZ3ze7zQ

llm_client.py

@@ -24,7 +24,8 @@ import datetime as _dt
 import json
 import logging
 import threading
-from typing import Any, Dict, Optional
+import time
+from typing import Any, Dict, Optional, Tuple
 
 import requests
 
@@ -66,6 +67,10 @@ class DeepSeekClient:
         self._count_day: Optional[_dt.date] = None
         self._count = 0
         self._warned: set = set()
+        # Health stamps for status displays: last successful call and
+        # last failure (ts, kind). Read-only for consumers.
+        self.last_ok: float = 0.0
+        self.last_error: Optional[Tuple[float, str]] = None
 
     @property
     def available(self) -> bool:
@@ -125,9 +130,11 @@ class DeepSeekClient:
             resp = self._session.post(
                 DEEPSEEK_URL, json=body, timeout=self._timeout)
         except requests.RequestException as e:
+            self.last_error = (time.time(), "network")
             self._warn_once("network", "DeepSeek call failed: %s", e)
             return None
         if resp.status_code != 200:
+            self.last_error = (time.time(), f"http_{resp.status_code}")
             self._warn_once(
                 f"http_{resp.status_code}",
                 "DeepSeek HTTP %s: %s", resp.status_code, resp.text[:200])
@@ -137,8 +144,11 @@ class DeepSeekClient:
         except ValueError:
             parsed = None
         if parsed is None:
+            self.last_error = (time.time(), "parse")
             self._warn_once("parse", "DeepSeek response was not the "
                             "expected JSON object — ignoring")
+        else:
+            self.last_ok = time.time()
         return parsed
 
     @staticmethod