Close 0.8.8 release readiness gaps

[runyourempire]

Adversarial release-readiness follow-up for 0.8.8.

Changes:

• Bound main-thread dispatch lock acquisition so the documented 10s deadline also covers waiting for the serialization lock.
• Fix 0.8.8 changelog compare links.
• Correct historical CLAUDE.md version headings and stale server.json bump-script note.
• Stop bump scripts from broad-replacing historical CLAUDE.md release notes on future version bumps.

Local verification:

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets -- -D warnings
• cargo clippy --workspace --all-targets --no-default-features -- -D warnings
• cargo clippy --workspace --all-targets --release -- -D warnings
• cargo test --workspace
• RUSTDOCFLAGS="-D warnings" cargo doc --workspace --no-deps
• ./scripts/preflight.ps1
• cargo build --workspace
• cargo package --allow-dirty -p victauri-core -p victauri-macros -p victauri-plugin -p victauri-test -p victauri-cli -p victauri-watchdog
• cargo audit
• cargo deny check
• cargo semver-checks check-release --workspace
• bash tools/test-install-gate.sh