Companion pages — method detail, data appendices, and the occasional dogfooded rendering — that would have swamped the post they belong to.
A demo of the orienting-codebases skill: structural pipeline over antirez/ds4, a 259,000-line C inference engine, spent on two hands-on exercises with hidden answers instead of an analysis dump.
Working files behind I Already Had the Paper: the paper-shaped write-up, the ledger of all twenty dead ends with the argument that killed each, every engine and results file, and the caveats the post compresses.
All 54 trials of the Haiku 4.5 / Gemini 2.5 Flash-Lite confounding eval: protocol, verbatim frames, seeded operands, per-trial tables, the failure gallery, and the prediction I got wrong.
Run trace, costs, the calibration set with arXiv IDs, and the three surviving pairs behind What the Embeddings Can't See.
The same argument as the post, rendered through the composing-html skill's own chrome rather than the house template.
The original draft: why agents should hand back HTML rather than prose about HTML.
Full experiment archives — raw runs, prompts, scores — live in references.