revert(rag): back out #2065 claim-leading condition binding after live canary regression

docs/branch-review-records/a843a22bab4d2c65ae47bc683f553fb5e5726f2fe111fb3f93fa9386e7b46b20.record.md

@@ -0,0 +1 @@
+| 2026-08-18 | claude/revert-2065-claim-condition-regression | df1266970dc7ba056142b6c39b8311c1914e473d | revert PR #2065 (claim-leading for/in condition binding) after live canary 32097916649 regressed agitation-im-po-route-short-terms to 0 citations; deterministic extractive path bisected to 964869fc3 | single-commit revert; probe restores 5 citations; offline 614/614; confirmation canary owed post-merge | vitest rag-claim-support 157/157; eval:rag:offline 614/614; check:rag:fixtures 36 golden; live probe x2 |

src/lib/rag/rag-claim-support.ts

@@ -166,11 +166,6 @@ function highRiskTriggerTokens(value: string) {
   const triggerPatterns = [
     /\b(?:when|whenever|if|unless|during|after|before)\b\s*([^,;.!?]+?)(?=\s*,|\s+\b(?:administer|avoid|cease|continue|discontinue|escalate|give|prescribe|start|stop|use|withhold)\b|[;.!?]|$)/gi,
     /\b(?:administer|avoid|cease|continue|discontinue|escalate|give|prescribe|start|stop|use|withhold)\b[^,;.!?]{0,80}?\bfor\b\s*([^,;.!?]+?)(?=\s+\bfor\b|\s*,|[;.!?]|$)/gi,
-    // Condition-first phrasing: a claim-leading "For <population>, <directive> …"
-    // or "In <state>, …" binds its condition exactly like when/if phrasing —
-    // previously this shape extracted no tokens, so the condition never had to
-    // appear in the supporting segment (S1c follow-up).
-    /^\s*(?:for|in)\s+([^,;.!?]{1,60}?)\s*,/gi,
   ];
   for (const pattern of triggerPatterns) {
     for (const match of value.matchAll(pattern)) {

tests/rag-claim-support.test.ts

@@ -285,54 +285,6 @@ describe("deterministic claim support", () => {
     ).toBe(false);
   });
 
-  it("binds a claim-leading population condition to the supporting segment (condition-first trigger)", () => {
-    // "For elderly patients, …" previously extracted no trigger tokens, so an
-    // atom-free neighbouring bullet that merely mentions the population could
-    // lend its topics and let the adult dose be mis-bound to the elderly claim.
-    // (A digit-bearing population phrase like "over 65 years" is already caught
-    // by the atom-free-neighbour rule; this pins the digit-free phrasing.)
-    const adultDoseWithPopulationProse = source(
-      "adult-dose-population-prose",
-      [
-        "• The usual oral starting dose for adults is 500 mg nocte.",
-        "• Elderly patients require cautious dose titration.",
-      ].join("\n"),
-      { title: "Lithium Clinical Guideline(EMHS)", file_name: "Lithium Clinical Guideline(EMHS).pdf" },
-    );
-
-    expect(
-      sourceDirectlySupportsAnswerText(
-        "For elderly patients, start lithium at 500 mg nocte.",
-        adultDoseWithPopulationProse,
-      ),
-    ).toBe(false);
-  });
-
-  it("keeps supporting a faithful condition-first restatement whose segment covers the condition", () => {
-    const emhs = source(
-      "emhs-lithium-condition-first",
-      [
-        "• The usual oral starting dose for adults is 500 mg nocte and for patients over 65 years it",
-        "is 250 mg nocte.",
-      ].join("\n"),
-      { title: "Lithium Clinical Guideline(EMHS)", file_name: "Lithium Clinical Guideline(EMHS).pdf" },
-    );
-
-    expect(sourceDirectlySupportsAnswerText("For patients over 65 years, start lithium at 250 mg nocte.", emhs)).toBe(
-      true,
-    );
-  });
-
-  it("binds a claim-leading in-condition the same way", () => {
-    const renal = source("renal-monitoring", "Monitor lithium levels closely in renal impairment.");
-    const hepatic = source("hepatic-monitoring", "Monitor lithium levels closely in hepatic impairment.");
-
-    expect(sourceDirectlySupportsAnswerText("In renal impairment, monitor lithium levels closely.", renal)).toBe(true);
-    expect(sourceDirectlySupportsAnswerText("In renal impairment, monitor lithium levels closely.", hepatic)).toBe(
-      false,
-    );
-  });
-
   it("keeps a wrapped escalation recipient in the directly supporting source segment", () => {
     const wrappedRule = source(
       "wrapped-escalation-rule",