274: move the song and its working files into wip/274/

Eleven files were cluttering wip/ alongside an unrelated draft. They now
sit together in their own directory.

Checked against the pipeline in novoyuuparosk-auto-wiki before moving:

- discovery is source_dir.rglob("*.md"), so nested directories are found
- the skip test is `"wip" in rel.parts`, which still excludes wip/274/
  while the song is in progress
- relative links resolve as (path.parent / rel_path), i.e. against the
  file's own directory, so the three docs keep linking to each other
- the lrc field resolves as abs_path.parent / lrc_rel, so 274.lrc must
  and does sit beside 274.md

Both scripts locate their inputs from __file__, so they needed no change;
verified after the move that --check is clean and the page rebuilds all
132 entries.

Non-Markdown files are never read by the pipeline at all.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S6MpcBisZYhX45oDGRRJoz

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