fix(activity): re-apply source classifier + add date-prefix slug fallback

Regression: aeae712's source/create distinction was lost — VPS reverted to
pre-aeae712 behavior where every extract/* knowledge PR returned type=create
regardless of whether a claim was written. Source archives surfaced as
"New claim" chips with date-prefix slugs that 404 on click.

Root cause: aeae712 was deployed via local file copy and never pushed to
origin; a subsequent rsync from origin/main overwrote it with the older
classifier. This branch ships from origin so deploy.sh's repo-first gate
makes recurrence impossible.

- Restore aeae712: extract/* + empty description -> source, with
  empty claim_slug + source_slug field, ci_earned 0.15
- Add Leo's regex fallback: candidate_slug matching
  ^\d{4}-\d{2}-\d{2}-.+-[a-f0-9]{4}$ -> source regardless of branch
  /commit_type/description state. Catches edge cases where description
  leaks but is just a source title (slugified into the inbox filename
  pattern), not a claim insight.
- Add 'challenge' to _FEED_COMMIT_TYPES (latent bug — challenge PRs
  would be filtered out before classification because the filter
  list omitted them; memory says 0 challenges exist so it never
  triggered, but schema support belongs in the filter)
- _build_events: compute candidate slug before classify so the regex
  fallback has a slug to inspect

Verified locally on Leo's example PRs (#4014, #4016) — both classify
as source. VPS smoke pending deploy.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

diagnostics/activity_feed_api.py

@@ -9,6 +9,16 @@ DB_PATH = "/opt/teleo-eval/pipeline/pipeline.db"
 _cache = {"data": None, "ts": 0}
 CACHE_TTL = 60  # 1 minute — activity should feel fresh
 
+# commit_types we surface in the activity feed. `pipeline` is system
+# maintenance (reweave/fix auto-runs, zombie cleanup) and stays hidden.
+_FEED_COMMIT_TYPES = ("knowledge", "enrich", "challenge", "research", "entity", "extract", "reweave")
+
+# Source-archive slugs follow YYYY-MM-DD-publisher-topic-HASH4 — they're
+# inbox archive filenames, not claim slugs. Used as a fallback signal when
+# branch/description heuristics miss (e.g. populated descriptions that
+# happen to be source titles, not claim insights).
+_SOURCE_SLUG_PATTERN = re.compile(r"^\d{4}-\d{2}-\d{2}-.+-[a-f0-9]{4}$")
+
 
 def _get_conn():
     conn = sqlite3.connect(DB_PATH)
@@ -17,19 +27,52 @@ def _get_conn():
     return conn
 
 
-def _classify_event(branch, description, commit_type):
-    if commit_type != "knowledge":
+def _is_source_slug(slug):
+    return bool(slug and _SOURCE_SLUG_PATTERN.match(slug))
+
+
+def _classify_event(branch, description, commit_type, candidate_slug=None):
+    """Return one of: create | enrich | challenge | source | None.
+
+    Source-archive PRs are extract/* branches that filed a source into
+    inbox/archive/ but didn't produce a claim. Two signals classify them
+    as 'source' (defense in depth):
+      1. extract/* branch with empty description (no claim title produced)
+      2. candidate_slug matches YYYY-MM-DD-...-HASH4 (inbox filename pattern)
+    """
+    commit_type_l = (commit_type or "").lower()
+    branch = branch or ""
+    description_lower = (description or "").lower()
+    has_desc = bool(description and description.strip())
+
+    if commit_type_l not in _FEED_COMMIT_TYPES:
         return None
-    if branch and branch.startswith("extract/"):
-        return "create"
-    if branch and branch.startswith("reweave/"):
-        return "enrich"
-    if branch and branch.startswith("challenge/"):
+
+    # Explicit challenge signals win first.
+    if (commit_type_l == "challenge"
+            or branch.startswith("challenge/")
+            or "challenged_by" in description_lower):
         return "challenge"
-    if description and "challenged_by" in description.lower():
-        return "challenge"
-    if branch and branch.startswith("enrich/"):
+
+    # Enrichment: reweave edge-connects, enrich/ branches, or commit_type=enrich.
+    if (commit_type_l == "enrich"
+            or branch.startswith("enrich/")
+            or branch.startswith("reweave/")):
         return "enrich"
+
+    # Source-only: extract/* with no claim description means inbox archive
+    # landed but no domain claim was written.
+    if branch.startswith("extract/") and not has_desc:
+        return "source"
+
+    # Belt-and-suspenders: if the slug we'd surface to the frontend looks
+    # like an inbox archive filename (date-prefix-hash), treat as source
+    # regardless of branch/commit_type/description state. Catches cases
+    # where description leaked but is just a source title, not a claim.
+    if _is_source_slug(candidate_slug):
+        return "source"
+
+    # Everything else with a description is a new claim.
     return "create"
 
 
@@ -81,33 +124,60 @@ def _hot_score(challenge_count, enrich_count, signal_count, hours_since):
 def _build_events():
     conn = _get_conn()
     try:
-        rows = conn.execute("""
+        placeholders = ",".join("?" * len(_FEED_COMMIT_TYPES))
+        rows = conn.execute(f"""
             SELECT p.number, p.branch, p.domain, p.agent, p.submitted_by,
                    p.merged_at, p.description, p.commit_type, p.cost_usd,
-                   p.source_channel
+                   p.source_channel, p.source_path
             FROM prs p
             WHERE p.status = 'merged'
-              AND p.commit_type = 'knowledge'
+              AND p.commit_type IN ({placeholders})
               AND p.merged_at IS NOT NULL
             ORDER BY p.merged_at DESC
             LIMIT 2000
-        """).fetchall()
+        """, _FEED_COMMIT_TYPES).fetchall()
 
         events = []
         claim_activity = {}  # slug -> {challenges, enriches, signals, first_seen}
 
         for row in rows:
-            event_type = _classify_event(row["branch"], row["description"], row["commit_type"])
+            slugs = _extract_claim_slugs(row["description"], row["branch"])
+            candidate_slug = slugs[0] if slugs else ""
+            event_type = _classify_event(
+                row["branch"], row["description"], row["commit_type"],
+                candidate_slug=candidate_slug,
+            )
             if not event_type:
                 continue
 
             contributor = _normalize_contributor(row["submitted_by"], row["agent"])
-            slugs = _extract_claim_slugs(row["description"], row["branch"])
             merged_at = row["merged_at"] or ""
 
-            ci_map = {"create": 0.35, "enrich": 0.25, "challenge": 0.40}
+            ci_map = {"create": 0.35, "enrich": 0.25, "challenge": 0.40, "source": 0.15}
             ci_earned = ci_map.get(event_type, 0)
 
+            # Source events never carry a claim_slug — no claim was written —
+            # so the frontend can't produce a 404-ing claim link.
+            if event_type == "source":
+                summary_text = _summary_from_branch(row["branch"])
+                source_slug = (
+                    _summary_from_branch(row["branch"]).lower().replace(" ", "-")
+                    or row["branch"]
+                )
+                events.append({
+                    "type": "source",
+                    "claim_slug": "",
+                    "source_slug": source_slug,
+                    "domain": row["domain"] or "unknown",
+                    "contributor": contributor,
+                    "timestamp": merged_at,
+                    "ci_earned": round(ci_earned, 2),
+                    "summary": summary_text,
+                    "pr_number": row["number"],
+                    "source_channel": row["source_channel"] or "unknown",
+                })
+                continue
+
             for slug in slugs:
                 if slug not in claim_activity:
                     claim_activity[slug] = {
@@ -164,8 +234,8 @@ def _sort_events(events, claim_activity, sort_mode, now_ts):
             return _hot_score(ca["challenges"], ca["enriches"], ca["signals"], hours)
         events.sort(key=hot_key, reverse=True)
     elif sort_mode == "important":
-        type_rank = {"challenge": 0, "enrich": 1, "create": 2}
-        events.sort(key=lambda e: (type_rank.get(e["type"], 3), -len(e["summary"])))
+        type_rank = {"challenge": 0, "enrich": 1, "create": 2, "source": 3}
+        events.sort(key=lambda e: (type_rank.get(e["type"], 4), -len(e["summary"])))
     return events
 
 
@@ -175,6 +245,8 @@ async def handle_activity_feed(request):
         sort_mode = "recent"
     domain = request.query.get("domain", "")
     contributor = request.query.get("contributor", "")
+    type_param = request.query.get("type", "")
+    type_filter = {t.strip() for t in type_param.split(",") if t.strip()} if type_param else None
     try:
         limit = min(int(request.query.get("limit", "20")), 100)
     except ValueError:
@@ -196,6 +268,8 @@ async def handle_activity_feed(request):
         filtered = [e for e in filtered if e["domain"] == domain]
     if contributor:
         filtered = [e for e in filtered if e["contributor"] == contributor]
+    if type_filter:
+        filtered = [e for e in filtered if e["type"] in type_filter]
 
     sorted_events = _sort_events(list(filtered), claim_activity, sort_mode, now)
     total = len(sorted_events)