docs(release): complete the v1.2.63 notes

[arul28]

The staged v1.2.63 entry predates #1134/#1135 (update-check fixes), #1136 (provider config), and #1137 (the GitHub App credential overhaul). This amends the existing entry across changelog/v1.2.63.mdx, changelog/index.mdx, and CHANGELOG.md — no new version. docs.json already carries the page.

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Note

Low Risk
Documentation-only changelog edits with no product or security code changes.

Overview
Completes the already-staged v1.2.63 notes (date moved to 2026-08-20) so they cover work that landed after the first draft.

Adds GitHub App credential overhaul copy (#1137): coordinated renewal, honest credentialState, typed OAuth errors, shared file-backed store, disconnect, and faster post-reauth recovery. Also documents update-check fixes (#1134/#1135) and that ADE no longer overrides user provider config (#1136).

Same story is mirrored in CHANGELOG.md, changelog/v1.2.63.mdx, and the latest-release card on changelog/index.mdx. No new version.

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