AGENTS.md is the file; CLAUDE.md imports it

Every agent here except Claude Code reads AGENTS.md -- pi, codex, and aider now
that its read: says so. The vendor-neutral name was the symlink and the
Claude-specific one the real file, with a header saying the file was guidance
"to Claude Code". Swapped, keeping history on the real file through git mv.

Claude Code has read AGENTS.md directly since v2.1.277 and the machine this was
done on is newer, so the obvious move was to delete CLAUDE.md. Checking the
other machines first was worth it: four were on versions between 2.1.158 and
2.1.263, and a session on any of them would have found no instructions at all.

So CLAUDE.md stays as one line, `@AGENTS.md`, which the documentation endorses
for exactly this case and which -- unlike the symlink it replaces -- works on
Windows and does not trip Claude Code's refusal to write through a symlink. The
header says to delete it once every machine is current.

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