docs: cite platform-ceremonies 4.1 for the attested-data bytes

[xgreenx]

Three comments cite ceremony-common §9.1 for the attested-data bytes; §9.1 holds verification and fee rules, the byte format is platform-ceremonies §4.1 "Attested data", added by libid-org/libID#112.

Changes

• src/jwks/mod.rs:23: NotarizedSession doc cites platform-ceremonies section 4.1.
• src/proof.rs:5: module doc cites platform-ceremonies section 4.1.
• tests/e2e_real.rs:140: created_at doc cites platform-ceremonies section 4.1.
• Rewrap: "section 4.1" stays on one line, so grep 'section 4.1' finds all three.

Verified

• Bytes 32..40 big-endian createdAt matches libid-transcript v0.6.0 (the Cargo.lock pin) and the §4.1 table on docs(specs): define the attested-data format X and GitHub pin libID#112.
• No other §9.1 citation left in src, tests, README.md.
• cargo +nightly-2026-08-10 fmt --all -- --check and cargo build --all-targets pass.
• Comment-only diff; Rust skill rules checked: comments carry the why only, describe the thing.

Not verified / known issues

• Merge order: merge after docs(specs): define the attested-data format X and GitHub pin libID#112; until then the citations point at a section main lacks.
• Spec scope: §4.1 on that PR names X and GitHub sessions; the Google JWKS reading the keeper notarizes uses the same AttestationWire record but is not named there. Spec follow-up, no keeper change.

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