Refurnish reader presentation and add LLM discovery guidance

[GoGoKo699]

Readers need a compact entry point and clear routes from the chosen tutorial to the proof. This adopts the owner's Collective-Emission-Interface-Limits presentation pattern and exact purpose/contact wording.

Changes:

• Refurnish README around an early Read next table, the model, return law, mechanism, tutorial, boundaries and reproduction.
• Add docs/README.md with a guided learning sequence and full documentation map; connect TUTORIAL.md to it.
• Add llms.txt with relevance questions, search phrases, canonical raw source URLs, exact claim domain and attribution guidance.
• Replace the old README notice with the owner's exact Purpose and contact paragraph and clickable mailto link. The same text appears in llms.txt.
• Record the presentation convention in maintenance guidance.

Scientific claims, proof files, source-access records, all 27 mapped inputs, scripts, saved references, dependencies and verification policy are preserved. The finite-volume row retains the shrinking-minimum domain, and the guide states a fixed margin below b=1 without labeling it a proved crossover.

Validation:

• All 60 existing supplementary checks passed locally; logs and reports retained in presentation-verification-2026-10-07 beside the checkout.
• Documentation integrity passed (27 preserved inputs; 295 local links).
• All 23 math expressions in the changed reader files rendered through KaTeX; seven Markdown tables have consistent columns.
• All 110 local reading links and their referenced heading anchors checked; raw LLM source paths resolve to maintained files.
• Exact contact wording verified in README and llms.txt; diff and scientific preservation reviewed.
• The actual PR and post-merge workflows completed successfully; their checkout revisions, logs, suite outcomes and artifact metadata were inspected.
• Each hosted run passed all 60 supplementary checks and all five scientific suites: 28 groups and 272 controlled cases. Scientific assertions, case counts and reference agreement under the existing policy all passed.
• Each run retained 526 raw differences. Generated outputs are not byte-identical to the saved references. Suite 07 retains its existing eight reviewed workload fields and reports raw reference agreement as false; no reference values, tolerances or workload policy were changed.
• Preserved-source checks passed, and both runs uploaded raw JSON comparisons, logs and the tracked source snapshot.
• The local checkout is clean on merged main b09f51a36f176b4b663ca6282185e5db7a537c7d, with the tested candidate tree 94c4214cb8aafd65607be8b8c8c16dbc7c44389a. Its integrity check also passed.

Stage	Checked revision	Workflow	Raw evidence
PR	fe9e8e728a7de794ca1486382bafbbec56951b4f (test merge of candidate ae3d01b803cdbfc83e4c6bcefc105d7d728aa387)	37645115536 — success	11494222602
Merged main	b09f51a36f176b4b663ca6282185e5db7a537c7d	37646017518 — success	11494812770

Artifact SHA-256 digests: PR c4eecfd58ca8cdd63215a14eed7cef06b20e7e276199fdecaecd6b70952a7f0c; merged main 563a57aa0b9c2f7609513f2e824c62addedef7060489de27e2cde1fd4569619a. Both use the unchanged 14-day artifact retention (expiry 21 October 2026).