docs(claude-md): move the invariant ledger to docs/invarianter.md, verbatim

CLAUDE.md had grown to 310 919 bytes against Claude Code's 150 000-character
injection limit, so every row past the cut reached no session. The 93 measured
rows move to docs/invarianter.md in their original order; CLAUDE.md keeps the
eight short standing rules and a pointer, and says new rows are written there.

Verified as a partition: every moved line appears in the original section in
order, the eight kept rows likewise, and head/tail of CLAUDE.md are byte-
identical apart from the visitor note. One code span is reworded and the ledger
head says so: the funn 99 row cited MAF's DEFAULT_MAX_CONSECUTIVE_ERRORS_PER_
REQUEST with its value inside the span, which the doc-constant-sync gate reads
as a citation of a constant in this package (fail-closed on an unknown name).
The ledger is registered in _LIVE_DOCS, so that gate now also guards it.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tests/test_doc_constant_sync_loadbearing.py

@@ -54,6 +54,7 @@ _LIVE_DOCS = (
     "docs/knowledge-base-recipe.md",
     "docs/kunnskapsbase-for-en-kjoring.md",
     "docs/okf-konsum-kontrakter.md",
+    "docs/invarianter.md",
 )
 
 # A dated path segment marks a point-in-time record. ``docs/fase1-spikes/`` is the one archive whose