Move types.ts, selectors/{index,create,resolve}.ts, and pdf-selector-math.ts
out of citation-evidence/src/anchor/ into src/ (pdf math under src/pdf/).
Rewrite all @shared/* imports to @citation-evidence/engine/shared; wire the
public entrypoint (src/index.ts) and the ./pdf subpath. Port the three unit
suites. Confidence ladder and selector-redundancy rules preserved verbatim.
Verified: pnpm test (29 passed), typecheck, and lint all green.
Also adds Node/TS .gitignore entries and the pnpm lockfile.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
tegwick
bd7f56c111