Curation v2 step 1: three-way feedback, rating events, reader profile

- Migration 0002: rating_events, article_embeddings, interest_embeddings,
  article_assessments, candidate_runs, runs.config_json/provider_costs_json,
  issue_articles.why; copies ratings into rating_events and drops ratings and
  feed_priors (scores stays until step 4).
- Vote is Loved | Good | NotForMe; legacy `up` links still verify as Loved.
- Footer offers Loved it / Good / Not for me; the confirmation page offers the
  other two so a mis-tap can be corrected. handle_rating appends one event.
- db::current_ratings implements the latest-explicit-event rule with summaries
  and facets; `ratings list|set|clear` CLI appends source='cli' events.
- data/profile.md replaces the hard-coded reader prose; the system prompt is
  rebuilt every run in the §8.4 order with a recent-verdicts block.
- Weekly rebuild reads summaries, facets and notes; feed priors removed.

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

tests/m3_curation.rs

@@ -190,7 +190,18 @@ fn scour_opml_still_yields_the_interest_list() {
 
     // The assembled profile is what actually reaches DeepSeek as the system
     // prompt; it must mention the stated preferences and the interests (§3.6).
-    let document = profile::build(&interests, profile::NO_LEARNED_ADJUSTMENTS);
+    let profile_file = profile::load_profile(Path::new(concat!(
+        env!("CARGO_MANIFEST_DIR"),
+        "/data/profile.md"
+    )))
+    .expect("profile file");
+    let document = profile::build(
+        &profile_file.body,
+        &interests,
+        profile::NO_LEARNED_ADJUSTMENTS,
+        &[],
+        60,
+    );
     assert!(document.contains("Rust"));
     assert!(document.len() > 1000, "the profile is suspiciously short");
 }