fix(telemetry): the human half of the pull ledger recorded one kind in three

Opening a snippet in the UI recorded rest_snippet. Opening a note or a task
recorded nothing — so the most direct evidence the product has that anyone
cares about a record existed for one kind out of three, and the other two sat
at zero pulls looking like dead weight beside a kind that merely had a counter.

Not an open question about intent: models/note_usage.py already documented
'rest_note' as a source value. Nothing wrote it. The design named it and the
implementation stopped at snippets.

Adds rest_note and rest_task. Tagged by SURFACE rather than by the record's
kind, matching rest_snippet — the kind is a join away, but which surface asked
is not recoverable after the fact. The mcp_/rest_ split stays load-bearing:
"is this dead weight" is served by any pull, "was that injected line useful" by
agent pulls alone, and a human clicking a link would inflate exactly the number
#1038 and #2085 gate on.

The vocabulary comment in the model was itself the stale-enumeration shape this
survey keeps finding — it named a source nothing wrote while omitting sources
that existed. Replaced with the naming CONVENTION plus a pointer to grep, which
cannot drift, rather than a longer list that would go stale the same way.

Guard extended to the REST surface, same derivation as the MCP half: a route
registered at exactly /<int:x> for GET is a detail view, and one reaching a
note-backed loader must record. Handler source is expanded one level through
module-private helpers, without which get_snippet_route — the route that
already got this right — would drop out of the check by loading via
_load_snippet. Verified the guard fires when a call is removed.

Renamed test_mcp_pull_telemetry.py -> test_pull_telemetry.py; it is no longer
only about MCP.

Closes #2476

src/scribe/routes/notes.py

@@ -22,6 +22,7 @@ from scribe.services.notes import (
     update_note,
 )
 from scribe.services.note_drafts import upsert_draft, get_draft, delete_draft
+from scribe.services.note_usage import record_pulled
 from scribe.services.note_versions import list_versions, get_version
 
 logger = logging.getLogger(__name__)
@@ -178,6 +179,13 @@ async def get_note_route(note_id: int):
     note, permission = result
     data = note.to_dict()
     data["permission"] = permission
+    # Opening the detail view IS a pull — the operator chose to look. Tagged by
+    # SURFACE, not by the record's kind, matching rest_snippet: the kind is a
+    # join away, but which surface asked is not recoverable after the fact.
+    # Keeping rest_* apart from mcp_* is load-bearing, not tidiness — "was that
+    # injected line useful?" is answered by agent pulls alone, and a human
+    # clicking a link would inflate exactly the number #1038 and #2085 gate on.
+    record_pulled(user_id=uid, note_id=note_id, source="rest_note")
     return jsonify(data)