v0.8.0

Changed

• .croc.toml is now discovered by walking up from the doc-tree
  ROOT to the git repo root, so the repo-scoped trace/hunt config can
  live at the project root next to pyproject.toml instead of buried in
  the docs subtree. A tree-local .croc.toml at ROOT is still found
  first, so existing layouts keep working. Discovery is bounded by the
  git repo root; outside a git repo only the tree-local file is read.
• Multiple doc trees per repo: a single .croc.toml can namespace
  per-tree config under [trees."<path>"] tables, keyed by each tree's
  path relative to the file. A per-tree table's trace/hunt/version
  override the top-level defaults for that tree; omitted fields inherit.
• croc molt no longer touches .croc.toml. It previously stripped
  the version marker and deleted or rewrote the file; now it leaves the
  file byte-for-byte intact (yours to keep or remove) and only emits a
  NOTE that a tree-local one was left in place. The version marker is
  an inert management signal — nothing branches on its value.

Internal

• Extracted the duplicated git_repo_root helper from attack/hunt
  into croc/gitutil.py; config is now the third caller. Removed the
  dead _molt_croc_toml strip helper.