v0.1.15

Added

• Hierarchical (monorepo-aware) config resolution (ADR 0018). Running poly
  from a monorepo root now discovers nested poly.toml files and cascades them
  the way ruff/eslint resolve config: a file is governed by the deep-merge of its
  ancestor config chain (workspace root as base, nearest config wins), so a
  sub-project's poly.toml declares only its diff and inherits [defaults], the
  [lint.*]/[fmt.*] rule tables, and [per-file-ignores] from above.
  • New [workspace] root = true marker bounds the upward cascade; a .git
    directory is an implicit boundary, so single repos need no annotation.
  • [discovery] exclude globs are unioned tree-wide, each rooted at its own
    config directory (a nested config prunes only its subtree); [per-file-ignores]
    globs resolve relative to their owning config's directory.
  • --config <path> pins a single config and bypasses nested resolution.
  • Fully back-compatible: a repo with one root poly.toml and no nested configs
    resolves every file to the root config, identical to before.