feat(plugin): Scribe replaces native memory by instruction; tighten project-scope discipline

Direction change (operator, see plan task #755 work-log): the plugin must
NOT depend on disabling a native Claude function to work. It earns its place
by steering behavior, not by toggling autoMemoryEnabled.

Memory doctrine (no dual-write):
- using-scribe SKILL.md gains "Scribe holds these functions — don't keep a
  second copy": route rules/recall/planning to Scribe, don't also write them
  to native auto-memory, never instruct disabling a native function, and
  accept a "Scribe-shaped hole" if the plugin is removed (recover over time).
- mcp/server.py _INSTRUCTIONS: drop the paragraph that told the model to
  create/refresh a "rules live in Scribe" pointer in CLAUDE.md / ~/.claude
  memory. That was an active dual-write instruction; the SessionStart hook is
  the bridge now. Replaced with the no-dual-write / no-settings-dependency
  doctrine. Supersedes plan #755 Phase 6 ("set autoMemoryEnabled:false").

Project-scope discipline (stop cross-project bleed):
- using-scribe SKILL.md gains "Stay inside the active project's scope": pass
  project_id to every read, only reference/offer work on the in-scope project,
  ask before switching.
- _INSTRUCTIONS scope bullet extended from reads to referencing/offering, and
  flags get_recent as cross-project.
- get_recent docstring gains a scope note steering to scoped list_* when a
  project is active.

plugin.json 0.1.4 -> 0.1.5 so clients' caches actually refresh (re-shipping
under the same version does not bust the cache).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/scribe/mcp/tools/recent.py

@@ -30,6 +30,10 @@ async def get_recent(days: int = 7, limit: int = 25) -> dict:
     Returns:
         {"items": [{"id", "type", "title", "updated_at"}], "total": int}
         Sorted by updated_at descending.
+
+    Scope note: this spans ALL projects and takes no project filter. When a
+    project is in scope, prefer list_tasks(project_id=...) /
+    list_notes(project_id=...) so you don't surface other projects' activity.
     """
     uid = current_user_id()
     days = max(1, min(days, 90))