v0.3.0

Added

• --include <GLOB> — a positive glob selector, the counterpart to -I/--ignore:
  it adds files of any type to the tree even when their extension maps to no known
  language (repeatable, pipe-separated; --include '*' shows every file). An included
  file's annotation is read marker-agnostically (keyed on the invariant Concern:
  opener), so extensionless and unrecognized files still surface their one-line
  annotation. Config-enablable via [display] include = ["*.sh", "Dockerfile"].
  --strict-check is unaffected — it stays recognized-languages-only (an unknown comment
  grammar cannot be validated).
• Library API — the crate now exposes its low-level primitives so another program can
  reuse the ignore-based walk (walk::configured_walk, walk::collect_code_files) and
  the annotation grammar (annotation::extract, the marker-agnostic annotation::extract_any,
  annotation::analyze) over files of any shape, driving its own rendering. The config,
  walk, and annotation modules are public, plus the build_globset glob-compile helper;
  the tree model, graph, renderers, and strict-check stay crate-internal.