EIP-1 and erc-template conformance for the core draft

[rasca]

Formatting-only pass bringing the core draft in line with EIP-1 and the official erc-template, verified this week against the live EIP-1 text, the erc-template, and the ethereum/ERCs CI configuration (eipw.toml). No design changes.

Stacked on #2 (activation-not-before) because it edits that branch's text; retarget to main after #2 merges.

What changed

• Preamble frontmatter replaces the H1 title and pre-draft blockquote: title, description (one sentence, under 140 chars, no "standard", no number), author, status: Draft, type: Standards Track, category: ERC, created, requires: 165. Headers in EIP-1's mandated order.
• ## Copyright added with the exact mandated wording (CC0, relative LICENSE link).
• RFC boilerplate upgraded to the full RFC 2119 + RFC 8174 sentence from the template, linked to rfc-editor.org (an allowlisted origin).
• RFC keywords confined to Specification per EIP-1's rule: Security Considerations now restates its guidance in lowercase prose (should / should not); every normative capital remains in the Specification section.
• Template-only top-level sections: "Prior art" folded into Motivation/Rationale; "Possible future extensions" became a "Deferred extensions" Rationale bullet. Final order: Abstract, Motivation, Specification, Rationale, Security Considerations, Copyright.
• Relative links in submission form: first mentions of ERC-165 and ERC-8033 link to ./eip-165.md / ./eip-8033.md (the form merged ERCs use; dead in this repo by deliberate choice). ERC-8033 gained a one-line characterization (multi-agent council oracles) instead of a bare URL.
• Kleros prior art cited descriptively: "the Kleros arbitration standard (numbered 792 in the Kleros ecosystem; never merged into the official proposal repositories)". Rationale: the files exist in neither ethereum/EIPs nor ethereum/ERCs, docs.kleros.io links are barred by the CI link allowlist, the eipw markdown-link-first lint requires the first mention of any literal "ERC-N" string to be a link, and a precedent search found zero merged ERCs citing ERC-792 by number. The Kleros links stay in AGENTS.md's Prior literature and will go in the discussions-to forum post.
• AGENTS.md: decision 26 records all of the above; the "prior-art links are inlined" convention is amended accordingly.

Deliberately not done here

• No Solidity interface block (excluded from this PR's scope).
• discussions-to is absent until the Ethereum Magicians thread exists.
• Author is listed by email; swap in a GitHub handle before submission (the ERCs auto-merge bot matches it).
• Abstract length untouched (template prefers a shorter paragraph; trimming risks touching ideas).
• The EAS normative-dependency question stays parked (AGENTS.md "Things to look at"); naming EAS in prose without links matches merged-ERC precedent (7484, 7506, 8226, 8273, 8326).

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