[REF] personalverrechnung: relocate Lexis360 raw layer to .lexis360/

Move the licensed PDF exports and the Layer-1 full texts from the
project root into the dot directory .lexis360/, keeping the root
listing to versioned content plus the tool checkouts.

The location also encodes provenance, distinct from .firecrawl/:
.lexis360/ holds user-supplied licensed exports that cannot be
re-fetched by an agent - if missing, stop and ask the user
(documented in MEMORY), whereas .firecrawl/ remains the home of
reconstructible web fetches.

- plain move of the unversioned directory (batch2/ subfolder spotted
  and left untouched for its own intake run)
- .gitignore, tool constants/messages, source.pdf/source.text
  frontmatter paths of all 55 curated entries, README/RUNBOOK/MEMORY
  mentions; kb.json/INDEX.md regenerated
- batch 2 (53 PDFs) recorded in MEMORY as staged in .lexis360/batch2/

Validated end to end: --extract 55/55 with stable ids, --registry
55 entries/6 clusters, --check 0 problems (every frontmatter path
resolves at the new location), no stale path references remain.

.gitignore

@@ -1,6 +1,6 @@
 __pycache__/
 *.pyc
 .firecrawl/
-Lexis360/
+.lexis360/
 odoo/
 odoo_enterprise/