v0.1.7 — reconcile parser perf + full regex alternation/grouping onto v0.1.6

Adds improvements absent from v0.1.6:
- ECMA-262 regex alternation '|' and grouping '()' implemented (Pike NFA),
  replacing the fail-closed subset; JSON Schema pattern alternation now validates.
- SIMD parser hot-path (~44-52% higher string/object parse throughput).
- Examples build again (examples/build.zig.zon + Zig 0.16 migration).
- ValidationReport.deinit convenience.
Docs reconciled; deferred items documented. No public API removed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>