v0.1.5

Added

• Reproducible token-cost benchmark (benchmark/run.mjs + frozen 103-line corpus + methodology): hashline vs str_replace on the same file with the same 12 replacements — 31% fewer output tokens over the session (43% on multi-line ranges), ~1.4× cheaper on effective cost at the 5× output-token rate. Deterministic: content-addressed self-checking edit script, pinned js-tiktoken cl100k_base devDependency. Run with npm run benchmark.
• README rewritten around the three pillars — token-saving, correctness, and the modern content-addressed edit pattern — with Mermaid diagrams, a str_replace comparison table, and an inspiration/lineage section (The Harness Problem, pi-hashline-edit, pi-hashline-edit-pro, pi-hashline-edit-lsz).