feat(reuse): recording gets a seam — the prior-art hook asks for create_snippet when duplication is proven and unrecorded (#2664)

Zero snippets were ever recorded outside sessions already thinking about
snippets: the read side had a real seam (the PreToolUse hook) and the record
side had a trailing clause of a floor bullet. The trigger moment — 'I just
wrote the second copy' — is mid-Write/Edit, so the nudge now rides the same
hook: when the local arm proves the definition exists elsewhere in the repo
AND Scribe returned no record of it, the context block asks for
create_snippet. Both gates or silence, so a brand-new helper and an
already-recorded one stay nudge-free.

Floor bullet promoted to name the trigger moments (extract, hoist, second
copy); guarded by test the same way the Systems reflex is. Plugin 0.1.29 so
the cache picks up the hook (#2209).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

plugin/hooks/scribe_prior_art.sh

@@ -196,6 +196,21 @@ if [ -n "$body" ]; then
   fi
 fi
 
+# ARM 1½ — the RECORD nudge (#2664). The local arm just proved the thing being
+# written already exists elsewhere in this repo, and Scribe returned no record
+# of anything for it. That is the one moment "record it" is earned rather than
+# noise: the duplication is demonstrated, not guessed. Gated on BOTH sides so
+# an ordinary new helper (no other copies) and an already-recorded one (the
+# server spoke) stay nudge-free — a reflex that fires on everything is one
+# that gets skipped. An unreachable server counts as "nothing recorded": the
+# local finding needed no server, and the nudge fails open with it.
+if [ -n "$local_lines" ]; then
+  n_recorded=$(printf '%s' "$body" | jq -r '.note_ids | length' 2>/dev/null) || n_recorded=0
+  if [ "${n_recorded:-0}" = "0" ] || [ "$n_recorded" = "" ]; then
+    local_context="${local_context}"$'\n'"> None of those existing copies is recorded in Scribe. If the version being written is the canonical one — or this edit is consolidating the copies — record it now with create_snippet (name, code, when-to-reach-for-it, location) so the next session is offered it instead of writing another copy."
+  fi
+fi
+
 # Local first. It answers "this already EXISTS", which is a stronger claim than
 # "this resembles something recorded" — and it is the one the recorded arms are
 # structurally unable to make.

plugin/hooks/scribe_static_context.md

@@ -52,11 +52,16 @@ for the operator's work, and as your own working memory across sessions.
   it. An untagged project record carries the `systems_hint` question instead,
   on creates, updates, and work-logs alike — treat it as the tagging question
   asked at the moment of work, not as noise to skip past.
-- **Reuse before rebuilding** — before writing a new helper/utility/component,
-  search recorded **snippets** (reusable code recorded once for recall) and
-  reuse the prior art instead of re-solving it; when you build something
-  reusable, record it with `create_snippet` (name, code, when-to-reach-for-it,
-  location) so a later session is offered it, not left to write it again.
+- **Reuse before rebuilding — and record what you build** — before writing a
+  new helper/utility/component, search recorded **snippets** (reusable code
+  recorded once for recall) and reuse the prior art instead of re-solving it.
+  The recording half has NAMED TRIGGERS, not a vibe: the moment you extract a
+  shared component, hoist a helper into a common module, or notice you are
+  writing the second copy of anything, record it with `create_snippet` (name,
+  code, when-to-reach-for-it, location) in the same breath as the commit.
+  Work that "refactors X into a shared Y" is not finished until Y is recorded
+  — an unrecorded shared component is invisible to every later session, which
+  is how a codebase grows four `.btn-primary` definitions.
 - Do **not** keep the operator's rules, plans, or project notes in local
   memory / CLAUDE.md in parallel with Scribe — Scribe holds the single copy.
 - **Compact at clean seams** — because you record as you go, a context