chore: prepare reactor 0.1.0 release

[irl-dan]

Summary

Promote the Reactor public packages from 0.1.0-rc.2 to stable 0.1.0 for the final reactor-v0.1.0 tag path.

This PR:

• bumps @openprose/reactor and @openprose/reactor-cradle to 0.1.0
• updates the flat-tokens standalone example to install stable packages
• refreshes the Cradle reactor package pin hash for the stable tarball
• updates release smoke/verifier expectations and docs that quoted the rc install line
• applies the rc.2 validation front-door cleanup by removing the two-project seam copy from the root README

Validation

• pnpm install --frozen-lockfile
• pnpm build
• pnpm lint
• node --test .github/scripts/verify-reactor-pin.test.mjs .github/scripts/smoke-reactor-flat-tokens-example.test.mjs .github/scripts/smoke-reactor-tarball-import.test.mjs .github/scripts/smoke-reactor-cradle-tarball-import.test.mjs .github/scripts/build-reactor-release-candidate-evidence.test.mjs .github/scripts/smoke-reactor-release-readiness-example.test.mjs .github/scripts/verify-reactor-publish-workflow.test.mjs → 35/35

After merge, the next release steps are tagging reactor-v0.1.0, watching ci-reactor-package.yml publish both packages with provenance, and moving latest to 0.1.0.