session-memory: map signals to catalog recommendations via covers (WP-0010 follow-up)

Closes the gap where recurring_error suggestions showed generic 'Investigate'
instead of the curated recommendation. Added a covers[] field to SolutionPattern
(lowercase substrings a pattern's recommendation also applies to) + Catalog.find_for
(exact key first, then covers match against signal key+locus). Retro now resolves
recommendations through find_for. Tagged the read-before-edit pattern with
covers=['file has not been read','modified since read','file_not_read'] (v1.0.1).
Live: file-not-read suggestions across all repos now inherit 'Read the file before
Edit/Write'. 6 new tests; suite 158/158.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

session_memory/curate/catalog.py

@@ -30,7 +30,7 @@ from .schema import SolutionPattern
 # Content fields that define a pattern's substance. Version, timestamps, status,
 # and distribution_ready are metadata — changes to them never bump the version.
 _CONTENT_KEYS = ("name", "polarity", "problem", "resolutions", "scope",
-                 "provenance", "rendering_hints")
+                 "provenance", "rendering_hints", "covers")
 
 ADDED = "added"
 UNCHANGED = "unchanged"
@@ -86,6 +86,22 @@ class Catalog:
         with open(path, encoding="utf-8") as fh:
             return [json.loads(line) for line in fh if line.strip()]
 
+    def find_for(self, signal_key: str, locus: str = "") -> Optional[SolutionPattern]:
+        """Best catalog pattern for a detect signal: exact id first, then ``covers``.
+
+        Lets a signal that doesn't share a pattern's exact key (e.g. a
+        ``recurring_error`` fingerprint) inherit the curated recommendation when a
+        pattern declares it covers that text.
+        """
+        exact = self.load(SolutionPattern.make_id(signal_key))
+        if exact is not None:
+            return exact
+        hay = f"{signal_key} {locus}".lower()
+        for p in self.list():  # sorted by id -> deterministic
+            if any(c.lower() in hay for c in p.covers):
+                return p
+        return None
+
     # --- the single write path ---------------------------------------------
 
     def upsert(self, pattern: SolutionPattern) -> str: