Release 0.2.1

[anilmurty]

Summary

• Bump pyproject.toml and sdk-ts/package.json (+ lockfile) to 0.2.1
• Cut from main tip (e1b89e4) — includes spans/stats doctor repair (DuckDB v1.5.2: spans column statistics corrupt after demo/synthetic-span writes — equality predicates return 0 rows #56), Codex legacy purge, and deferred items from issue Issues Deferred from 0.1.9 #48

Test plan

• CI green (lint, mypy, pytest matrix, sdk-ts npm test)
• After merge: create GitHub release v0.2.1 → triggers publish-pypi.yml and publish-npm.yml
• Verify pip install tokenjam==0.2.1 and npm view @tokenjam/sdk@0.2.1

🤖 Generated with Claude Code