fix(frank-large): load the model as its native 3-way split, not a concatenated file

The first cutover crash-looped the unit with 'invalid split file name':
the fetch script concatenated the three split parts into a single GGUF,
but part 1's header carries ggml.file_count=3, so the byte-correct
concatenation still advertises itself as a split and the loader demands
a -NNNNN-of-NNNNN filename.

- serve-frank-large.sh: -m points at part 1; llama.cpp loads the split
  natively (parts 2-3 auto-discovered in the same directory)
- deploy-remote.sh: LLM_LARGE_MODEL gate path follows
- download-frank-large-unsloth.sh: assembly removed; the parts ARE the
  canonical payload, verified against live Hub LFS oids
- docs: runbook model section + troubleshooting note, AGENTS.md, log
- the redundant 87 GiB assembled file is staged on dankclaw at
  ~/.AGENTTRASH/20260921-frank-large-assembled/

shared/homepage/admin.html

@@ -13,7 +13,7 @@
   <a id="bare-toggle" class="toggle" href="?bare=1">bare</a>
 </header>
 <div id="summary" class="summary"></div>
-<main id="grid" class="grid"></main>
+<main id="grid" class="sections"></main>
 <footer class="foot">
   <span>last master deployment: <span id="deployed-at"></span></span>
   <a href="/">home</a>