test-build: add --local-deps for in-repo deps

Resolve deps that are siblings in the target's own repo (not on SBo or
official Slackware) by prepending the target's repo root to the dep search
roots when --local-deps is passed. The SBo tree is still searched after.

Covers packages like huggingface_cli whose deps live in the same
maintenance repo. Adds two logic self-checks and updates CLAUDE.md,
README, and the test-build-slackbuild skill.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/CLAUDE.md b/CLAUDE.md
index c4813db..552f7d9 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -64,6 +64,10 @@ Deps are resolved from the SBo tree in the config (`SBO_TREE_CURRENT` /
    per run from the image's `/var/log/packages`), or
 3. an override (see below).
 
+With `--local-deps`, the target's own repo root (its grandparent dir) is
+prepended to the search roots, so a dep that is a sibling in the same repo (not
+on SBo) resolves and builds from there before the SBo tree is consulted.
+
 Deps build first and are cached; the target always rebuilds (that is the test).
 
 ### current-vs-stable overrides
@@ -101,7 +105,9 @@ built deps). Only **deps** are cached, never the target.
 
 `--stable` (15.0), `--dry-run`, `--yes`, `--no-cache`, `--keep` (copy the built
 target `.txz` to `<data>/kept/` so it can be installed on the host, e.g. to
-regenerate post-install artifacts), `--no-color`.
+regenerate post-install artifacts), `--local-deps` (also resolve deps from the
+target's own repo, its grandparent dir, prepended before the SBo tree, for
+packages whose deps are siblings in the same repo and not on SBo), `--no-color`.
 
 ## image-builder