feat(plugin): after-write hook — PostToolUse on Bash diffs the working tree and runs the prior-art + ledger arms on what was just written; shared scribe_defs.sh; plugin 0.1.39 (#2901, milestone 299 step 3)

Edits made through sed/heredocs/scripts never reached the PreToolUse
Write|Edit hook, so a whole class of writes got no prior-art hint, no
ledger feed and no duplicate-family warning. scribe_after_write.sh asks git
what changed since it last looked (per-session path+blob snapshot; first
call = files touched in the last minute), extracts the definitions in the
added lines and calls /api/plugin/prior-art with the same three dedup
channels the pre hook keeps. Never blocks; silent on any failure. The
extractor, the prose/data skip list and the local by-name arm move to
scribe_defs.sh, sourced by both hooks. Version bump covers the step-2 hook
change too (run 4239 failed only on the bump check).

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": "0.1.38",
+  "version": "0.1.39",
   "author": { "name": "Bryan Van Deusen" },
   "mcpServers": {
     "scribe": {