chore: release v0.2.0

[ElbertePlinio]

Summary

• bump all PickLab workspace package manifests and bun.lock to 0.2.0
• refresh docs/releases/UNRELEASED.md with user-facing and internal changes since v0.1.4
• harden the tag release workflow with tag/version validation, npm 11.5.1 trusted publishing, retry-safe npm publish, and a draft GitHub release for human review
• align repo release instructions with the draft-to-publish gate

PickLab is an npm CLI and has no Tauri/Cargo manifests, binary release artifacts, or latest.json updater feed; those Tauri-specific release steps are not applicable.

Release gates

• bun install --frozen-lockfile
• bun run typecheck
• bun run test — 78 files, 950 passed, 2 skipped
• bun run test:coverage — all thresholds met
• bun run build
• local release-infrastructure review clean after fix verification
• tag/package mismatch guard validated locally
• merge release PR
• tag v0.2.0
• verify npm publication and draft GitHub release
• polish and publish the GitHub release draft

No merge or tag is included in this PR.