chore: lockstep release 0.1.1

[sopak]

Summary

Synchronizes all crates to version 0.1.1 and switches to lockstep release workflow.

Changes

• Bump all crates to 0.1.1: xtax, xtax-blob-storage, xtax-encryption
• Fix release.yml: removed markdown code block wrapper, now valid YAML
• Lockstep validation: release.yml validates all 3 crates have matching version before publishing
• Drop per-crate workflows: removed publish-xtax.yml, publish-xtax-blob-storage.yml, publish-xtax-encryption.yml — replaced by unified release.yml
• Update CONTRIBUTING.md: document lockstep release process with single v* tag
• Update intra-workspace dependencies: xtax → xtax-encryption and xtax-blob-storage → xtax-encryption now reference 0.1.1

Release process (after merge)

git checkout main && git pull
git tag v0.1.1
git push origin v0.1.1

This triggers release.yml which:

1. Extracts version 0.1.1 from tag
2. Validates all 3 crates have matching version
3. Publishes xtax-encryption → xtax-blob-storage → xtax
4. Creates GitHub Release

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	0

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