feat(409): the reporting-back skill shapes the reply the operator reads (#4011)

Step 2 of milestone 409 "Response shapes". A reply written in the order the
work happened is accurate and still unreadable to someone who was not there.
The new bundled skill shapes it around where the work stands.

- Fires when an agent is about to report completion, hand off, ask the
  operator something, answer "where are we", or propose an approach.
- Every reply: conclusion first, one topic per section, visible priority,
  the ask in bold at the end, plain words, the work placed in Scribe.
- Placement is taken from the placement block step 1 returns (#4010), not
  recalled; untracked work is said to be untracked.
- Four families of shapes: Reports, Asks, Answers, Proposals, with the
  completion report written out in full.
- Domain-neutral: the worked example is a backup job, evidence is "what you
  could open to check it". Written as practices, and naming no instance rule.
- A structural guard pins the completion sections, the from-the-record
  placement, and the absence of software-only vocabulary.

Listed in the plugin README and manifest description; version minted.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

plugin/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "scribe",
-  "description": "Scribe system-of-record for Claude Code: MCP tools over your notes/tasks/projects/rules, a session-start push channel that surfaces your active-project context, process-skills (writing-plans, systematic-debugging, verification, brainstorming, reusing-code), and your saved Scribe Processes auto-surfaced as skills (/scribe:sync). Replaces superpowers + file-memory with one app-backed plugin.",
-  "version": "2026.09.14.1233",
+  "description": "Scribe system-of-record for Claude Code: MCP tools over your notes/tasks/projects/rules, a session-start push channel that surfaces your active-project context, process-skills (writing-plans, reporting-back, systematic-debugging, verification, brainstorming, reusing-code), and your saved Scribe Processes auto-surfaced as skills (/scribe:sync). Replaces superpowers + file-memory with one app-backed plugin.",
+  "version": "2026.09.14.1406",
   "author": {
     "name": "Bryan Van Deusen"
   },