fix(systems): sweeps are the discovery moment — zero-Systems hint, create_system dedup gate, prose inverted

First real-world test of the #2562 fixes (Scribe issue #2569): a Forge
session ran a whole-codebase audit and created zero Systems — endorsed
by the shipped guidance, whose "no particular area takes none" clause
read as an exemption for exactly the record type that enumerates the
subsystem vocabulary. And the systems_hint was silent for a zero-Systems
project, the one state nothing else nudges out of.

- systems_hint gains a zero-Systems branch: prompt the FIRST
  create_system instead of going quiet.
- create_system is duplicate-gated like the other creates (normalized
  name, archived included, fail-open) — liberal creation becomes safe by
  construction, so the guidance can stop preaching restraint.
- Prose inverted on every surface (hint text, create_system docstring,
  floor bullet, using-scribe step 7): audits/sweeps take several tags
  and mint the Systems they name; the gate is the guardrail against
  sprawl, not holding back; only a record genuinely about no particular
  area goes untagged.
- Plugin 0.1.26 -> 0.1.27.

Co-Authored-By: Claude Fable 5 <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 always-on rules + 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": "0.1.26",
+  "version": "0.1.27",
   "author": { "name": "Bryan Van Deusen" },
   "mcpServers": {
     "scribe": {