chore(release): sync v0.2.0-alpha.1 to develop

[pedrozaz]

Summary

• Back-merge the published v0.2.0-alpha.1 release metadata from main into develop.
• Synchronize package/workspace versions, lockfile, crate description, README examples, and changelog.
• No Rust source, kernel source, or PTX changes: the feature code was already merged to develop in feat(gpu): add transactional 2-opt search #19.

Verification

• The release PR chore(release): publish vrp-gpu 0.2.0-alpha.1 #20 and the main CI run passed.
• vrp-gpu 0.2.0-alpha.1 is published on crates.io; the signed tag points to the main release commit.
• docs.rs exposes the new GPU search API.

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