docs: real LLM transcript replaces the simulation (#106 step 8)

[hfoffani]

Final step of #106 (the harness merged in #113): docs/llm-interaction.md now tells the story with a real captured conversation instead of a scripted one.

The transcript (qwen/qwen-2.5-72b-instruct, 2026-07-13)

Better than the simulation we wrote by hand, because the failure→fix loop actually happened:

1. Model translates the courier problem into clean PDDL (two write_file calls)
2. validate passes — but solve rejects the domain: (:types ...) used without :typing, caught by requirements enforcement (Follow the level of expressiveness specified in :requirements #9)
3. The model reads the structured error, fixes the one line, re-validates, re-solves
4. ucs returns the provable optimum (cost 7.0, three-hop back road) and the model narrates it correctly

Honesty rules kept

• Tool outputs verbatim; the model's PDDL re-indented for readability, nothing else edited
• The capture box states model, date, harness, and that an earlier round with the same model was unsound (invented cost syntax) — the thesis in miniature
• No fabricated dialogue remains anywhere in the doc; the "LLMs get this wrong" claim now leans on the references + the recorded unsound round instead of a scripted quote
• The winning transcript is committed (force-added; the directory is otherwise gitignored) as provenance, linked from the doc

Unchanged

examples/pddl/courier-*.pddl stay as the curated reference (still pinned by tests/test_llm_doc.py, passing), and the References section (LLM+P, PlanBench) stays.

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