feat(500): reporting-back becomes the long-form reference behind the delivered shapes

The reply shapes are server product now, delivered at their moments, so the
skill stops restating them. Gone from it: the "Every reply" list, the
per-kind tables, and "The operator's own shapes come first" (preferences
arrive beside the shape on the same moments). It opens by saying where the
shapes come from (list_reply_shapes, the delivered core's header) and keeps
the reasoning: sections chosen not filled, a settled decision acted on,
placement from the record, who decides what, the assumptions an option
carries, the completion report worked in full, and the second pass. 13.5k to
10.7k characters.

The core gains the Finding kind the skill's table carried (2,150 of 2,200).
Tests follow the content: the kind and Approval-row pins move to the shapes,
a new test holds the worked example and the completion shape to the same
sections, and the guidance-ownership registry reads the delivered shapes as a
surface, owning the preference-wins and length topics there. using-scribe
points at the delivery and list_reply_shapes. #5496.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/scribe/mcp/tools/tasks.py

@@ -520,11 +520,11 @@ async def add_task_log(task_id: int, content: str) -> dict:
     return data
 
 
-# The in-band half of milestone 409 step 3. The reporting-back skill and the
-# static context carry the full shapes, but both live only in the Claude Code
-# plugin; a tool response reaches every MCP client, at the moment a piece of
-# work closes, which is exactly when the report is about to be written. One
-# line on purpose: a template here would be read as the reply itself.
+# The in-band half of milestone 409 step 3. The completion shape itself rides
+# the closing response as `reply_shape` (milestone 500); this is the one line
+# that says what the reply covers, for every MCP client, at the moment a piece
+# of work closes. One line on purpose: a template here would be read as the
+# reply itself.
 _CLOSING_STATUSES = ("done", "cancelled")
 REPORT_BACK_CUE = (
     "Reporting this to the operator? Say where it sits (from `placement`), "

src/scribe/services/reply_shapes.py

@@ -119,6 +119,7 @@ By kind:
 verdict · what exists · the gaps · a recommendation.
 - **Proposal** — two or three approaches, the trade-off of each, one recommendation. \
 A review is findings ranked by how much they matter.
+- **Finding** — what you found, why it happens, and what you decided and did about it.
 - **Progress** — a line or two. **Blocked** — what stopped, what you tried, what you need.
 - **Where are we** — the plan and its progress · done · open · needs you · next.