docs: record verified SDK 2.8.4 publication

[ty-everett]

Program and scope

• Tracker: fix(sdk): preserve empty metadata in existing wallet histories #591 and BotBoard [BotBoard][expired] ty-everett / Codex — BRC100 history compatibility and release acceptance #590.
• Program gate: reconcile completed SDK publication with release governance and generated documentation.
• SDK 2.8.4 was published by protected release 35962750434 from main 57b852d69809c678058b78de914841e17d3ac5ba. This records that fact and clears the pending SDK patch designation.
• Out of scope: package bytes, manifests, dependency locks, other candidate versions, service images and Wallet interoperability and reliability: bounded sync, proof recovery and BRC-118 payments #569.
• Exact locally reviewed head: fa061ccea3d15a987aa2bb36071642bca2d9e164.

Impact

• No public package source or manifest changed
• Documentation or examples changed

Verification

• Passed pnpm build, pnpm health:check, pnpm lint, pnpm format:check, pnpm typecheck, pnpm docs:build and pnpm docs:examples on Node 24.18.0. Documentation: 129 HTML files; examples: 8 compiled against 21 exact tarballs.
• Registry bytes, npm integrity, GitHub artifact attestations and npm provenance were verified against the release's single immutable candidate and exact source commit.
• Hosted CI: pending on this head. No runtime/conformance/coverage/bundle behavior changes.
• I self-reviewed the complete three-file diff for correctness, compatibility, artifacts, dependencies, docs and operations.
• All applicable checks are terminal and successful on the exact head.

Security and dependencies

• No dependency or lockfile change
• No new override, advisory dismissal, quality suppression or skipped test
• Exact-head CodeQL has no new alert
• Exact-head repository quality gate has zero new Sonar findings and unreviewed hotspots

Release and operations

• No npm publication was performed from a workstation or from this PR
• Published SDK byte identity remains unchanged; no additional version or image release is needed
• Generated migration guidance was regenerated from its governance source

Completion evidence

• Hosted checks and review conversations are complete
• The published compatibility patch needs no BRC100 call, wire or account-data migration

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[ty-everett]

Authoring-maintainer final review of exact head fa061ccea3d15a987aa2bb36071642bca2d9e164: the complete three-file diff only records the verified SDK 2.8.4 publication and regenerates migration documentation; no public package bytes, manifests, dependency locks or other candidates change.

Local build, health, lint, format, typecheck, documentation and packed documentation examples passed. Exact-head CI 35965754020 and CodeQL 35965753930 are successful; the merge gate validates the documentation-only runtime skips. The explicit zero-new-Sonar gate passed, the PR-ref CodeQL alert list is empty, and there are no review threads. Registry bytes/integrity/attestations/provenance match release 35962750434 and source 57b852d. No blocking findings. This is the authoring maintainer's review, not an independent review.