chore: publish template crate before derive

[RAprogramm]

Summary

• ensure the release workflow publishes masterror-template before masterror-derive, with an index sync pause between the crates
• bump masterror to 0.10.8 and update the changelog and README snippets accordingly

Testing

• cargo +nightly fmt --
• cargo +1.90.0 clippy -- -D warnings
• cargo +1.90.0 build --all-targets
• cargo +1.90.0 test --all
• cargo +1.90.0 doc --no-deps
• cargo deny check
• cargo audit

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https://chatgpt.com/codex/tasks/task_e_68cf3d978f04832ba7d447c18d645252