chore: prepare v0.1.42 release

[kaleab-kali]

Summary:

• Bump zaphod-cli crate metadata to 0.1.42.
• Move the handoff --require-target-claim changelog entry under the 2026-07-10 release heading.

Tests:

• cargo fmt --all -- --check
• cargo clippy --all-targets --all-features --target-dir target\v0.1.42-release-gate -- -D warnings
• cargo test --all-targets --all-features -j 1 --target-dir C:\tmp\zaphod-v0.1.42-release-test
• git diff --check
• C:\tmp\zaphod-v0.1.42-release-test\debug\zaphod.exe --version
• cargo package --allow-dirty --target-dir C:\tmp\zaphod-v0.1.42-package-gate