docs: record the verified public launch

[kabudu]

Summary

• mark the authorized Pages activation and all M67 launch gates complete
• record exact live Pages and master CI evidence from source commit 08df159
• document deployed desktop/mobile, asset, metadata, and accessibility verification
• add post-release Pages fixes under Keep a Changelog’s Unreleased section
• update the site validator from the obsolete pre-activation wording to the verified live-status invariant

Acceptance evidence

• Pages run 31324873576 — passed from 08df159
• portable CI run 31324873617 — passed from 08df159
• live 1440×1000 and 390×844 inspection — no broken images or page-level overflow
• deployed page and six public assets — HTTP 200
• crates.io and docs.rs 0.2.0-rc.4 — independently verified
• ./scripts/ci-local.sh — passed before commit

This PR records evidence only; it does not broaden Telosieve’s evaluation or no-target-mutation claims.

[kabudu]

Reviewed head 992660a67a7851ab38779abed756f6b0d120acb8 passed:

• full local ./scripts/ci-local.sh before commit
• hosted portable CI run 31325257211
• full local ./scripts/ci-local.sh again at the exact reviewed head
• complete remote diff inspected; no review threads or material findings

Proceeding with the privacy-safe local squash identity.

[kabudu]

Merged by privacy-safe local squash commit on master after complete remote-diff review and successful local and hosted CI.