Curation v2 step 5: deep assessment, utility, diversified shortlist

assess.rs replaces score.rs (DEEP_INSTRUCTIONS, representative sample
with [BEGINNING]/[MIDDLE]/[END], facets, cached deep rows with --rescore
bypass), rank.rs adds the utility blend over present signals with gate
ramps and the leader-clustered shortlist (cap 2 → 3 → uncapped, protected
top-N, exploration reserve), editor.rs replaces select.rs with the §13
rendering and utility-ordered fallbacks. ScoredArticle is gone; Candidate
is the only flow type. deep_batch_size replaces score_batch_size.

Started by Codex (cut off by its usage limit mid-verification) and
finished by a Claude agent from docs/plans/curation-v2-briefs/step5.md;
reviewed against plan §12–§13.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A1rCLQeKBgnBo3oTgHuTMe

src/curate/triage.rs

@@ -357,11 +357,14 @@ pub async fn run(
         let rows = sqlx::query(
             "SELECT article_id, stage, score, kind, rationale, assessed_at
              FROM article_assessments
-             WHERE model = ? AND prompt_version = ? AND assessed_at >= ?",
+             WHERE model = ? AND assessed_at >= ?
+               AND ((stage = 'triage' AND prompt_version = ?)
+                 OR (stage = 'deep' AND prompt_version = ?))",
         )
         .bind(&llm.model)
-        .bind(TRIAGE_PROMPT_VERSION)
         .bind(fmt_ts(since))
+        .bind(TRIAGE_PROMPT_VERSION)
+        .bind(super::assess::DEEP_PROMPT_VERSION)
         .fetch_all(db.pool())
         .await?;
         let pool_ids = pool;