fix(#4022): instruction surfaces stop describing the always-on tier milestone 394 removed

Skill bodies and tool docstrings still taught the deleted model: using-scribe
said always-on rules "arrive whether or not you ask" and that SessionStart may
inject a rule index; create_project, decide_project_inception and enter_project
said an undecided project gets "every always-on rulebook"; create_rule pointed
standards at "the always-on one"; the verification sweeps and
retrieval_telemetry listed always-on paths and a live preload.

Every passage now describes the current model: every rule is retrieved, a
rulebook binds only by subscription, an undecided project inherits nothing,
and the preload survives only in telemetry rows older than 394.

Also repairs three sentences left half-replaced by the 394 edits: the static
context's "If you have not loaded the no rule has arrived", create_rule's
"an A subscribed rulebook", and create_project's doubled
subscribe_rulebooks entry. Plugin version minted.

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

src/scribe/mcp/tools/projects.py

@@ -83,7 +83,7 @@ async def enter_project(project_id: int) -> dict:
 
     `inception` (milestone 297) appears ONLY when the project is yours and
     nobody has decided what it inherits: it carries the current defaults
-    (which always-on rulebooks bind, design system, Systems), what to ask the
+    (the rulebooks it could subscribe to, design system, Systems), what to ask the
     operator — once — and the decide_project_inception call that answers it;
     it repeats on every enter until a decision is recorded.
 
@@ -149,7 +149,7 @@ async def enter_project(project_id: int) -> dict:
         )
 
     # The inception ask (milestone 297): a project nobody has decided on
-    # inherits its defaults silently — always-on rulebooks, no design system,
+    # inherits nothing, silently — no rulebook subscriptions, no design system,
     # no Systems. Owner-only (deciding is the owner's), and only until a
     # decision is recorded; the key is ABSENT otherwise (#2483).
     inception_ask = None
@@ -288,8 +288,8 @@ async def create_project(
     before calling, ask the operator the four inception questions and pass
     the answers; a project created without any of them is UNDECIDED and
     enter_project will ask until decide_project_inception records it.
-    Defaults if nobody decides: every always-on rulebook binds, nothing is
-    subscribed, no design system, no Systems.
+    Defaults if nobody decides: no rulebook subscriptions, no design system,
+    no Systems.
 
     Args:
         title: Project name (required).
@@ -297,11 +297,10 @@ async def create_project(
         goal: The desired outcome or definition of done for the project.
         status: one of active (default), paused, completed, archived.
         color: Optional hex colour for the project card (e.g. "#6366f1").
-        subscribe_rulebooks: rulebook ids this project opts into. Since
-            milestone 394 subscription is the only way a rulebook binds a
-            project, so there is no automatic tier left to decline. Was
-            NOT inherit ([] = inherit them all). list_rulebooks shows which are
-        subscribe_rulebooks: rulebook ids to subscribe (the non-always-on ones).
+        subscribe_rulebooks: rulebook ids this project opts into.
+            Subscription is the only way a rulebook binds a project, so a
+            rulebook left out simply does not apply. list_rulebooks shows
+            which exist.
         design_system_id: the design system this project's UI is built from
             (list_design_systems); -1 = explicitly none; 0 = not stated.
         seed_systems: true mints the standard starter Systems (CI & Release,
@@ -351,9 +350,9 @@ async def decide_project_inception(
     unsubscribe_project_from_rulebook to undo one), replaces the design
     system, and never re-seeds Systems a project already has.
 
-    Args: as create_project's inception args. Passing nothing records an
-    inherit-all decision (every always-on rulebook binds, no subscriptions,
-    no design system, no seed) — a valid answer, stated.
+    Args: as create_project's inception args. Passing nothing records a
+    decision to take nothing (no subscriptions, no design system, no seed) —
+    a valid answer, stated.
     """
     uid = current_user_id()
     choices = _inception_choices(