rename(547): what people read says Grimoire

Step 1 of the Scribe -> Grimoire rename: every capitalised "Scribe" in prose
becomes "Grimoire" ("Fabled Scribe" -> "Fabled Grimoire") across the UI,
the PWA manifest and page title, the MCP instructions and tool docstrings,
hook and skill text, docs and README, with the tests that assert on that
prose moving with it. Old migrations keep their wording.

Identifiers are untouched here: the package, plugin name, MCP server key,
hook file names, env vars, the .scribe marker and FabledScribe repo/image
names move in steps 2 and 3, along with prose that quotes them.

The sweep matched "Scribe" only as a whole word, so describe/subscribe and
friends are untouched. The longer name took the MCP instructions one
character over their 1,600 budget; two phrases are shortened to fit.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_precompact_hook.py

@@ -3,7 +3,7 @@
 The mechanism this pins was read out of the installed Claude Code build, not
 out of the documentation, which describes a different one. Three facts decide
 whether the hook works at all, and all three are properties of what the shell
-writes rather than of anything Scribe runs:
+writes rather than of anything Grimoire runs:
 
   * **Exit 0.** The handler keeps a hook's stdout only when it `succeeded`,
     which is `status === 0`. A non-zero exit sends the same bytes down the
@@ -111,7 +111,7 @@ def test_the_instructions_name_what_has_to_survive():
     in the words a summarizer can act on."""
     said = _run(EVENT).stdout.lower()
     assert "id" in said and "title" in said
-    for anchor in ("in progress", "scribe", "not yet recorded"):
+    for anchor in ("in progress", "grimoire", "not yet recorded"):
         assert anchor in said, f"the instruction no longer mentions {anchor!r}"