Prepare @workit/core 0.2.0 ownership evidence release

[AdmilsonCossa]

Summary

Prepare @workit/core 0.2.0 with the core ownership and evidence foundation, npm package discoverability improvements, README contract clarifications, activity result normalization, and OpenTelemetry package-version provenance.

What changed

• Adds explicit ownership/evidence subpaths for replay receipts, receipt ledgers, receipt analysis, activity terminal boundaries, and resource ownership helpers.
• Improves npm discoverability with targeted keywords and a sharper package description.
• Clarifies the npm README examples for retry policy options, TaskFn invocation, renderTree(scope.status()), and work().do() fail-fast output.
• Documents work().do() buffering and the cooperative run.hedge() cancellation contract for losing branches.
• Normalizes activity results before persistence so first execution and replay return the same JSON value.
• Derives OpenTelemetry instrumentation version from package metadata.
• Bumps release metadata and citations to 0.2.0.

Validation

• npm run test:coverage - 24 files, 304 tests, 100% coverage
• npm run verify
• npm run bench:articles - 19/19 passed
• npm run test:evidence - 14/14 passed
• npm --workspace @workit/core run check:release - npm publish dry-run completed
• Hygiene before push: npm run check:no-network, npm run check:headers, npm run check:tests

Release notes

This is intended as the 0.2.0 release PR. Publishing should happen through the provenance workflow after CI is green and the signed release tag is created.