8n0 validate DIST_DIR before --clean rm -rf

The --clean action ran `rm -rf "$DIST_DIR"` after only an `[ -d ]` check,
so a misconfigured DIST_DIR (empty, /, $HOME, system dirs, etc.) could
recursively delete the wrong tree.

Add validate_clean_dist_dir (and resolve_dist_dir_path) in
config.validate.source.sh and call it in the --clean case before any
deletion. The guard canonicalizes DIST_DIR with `pwd -P` (handling ./
trailing slashes, symlinks and relative paths; for a not-yet-existing
dir it resolves the existing parent and re-attaches the basename) and
refuses to clean when the resolved path is empty, the filesystem root, a
well-known system directory, the resolved $HOME, or the current working
directory. Rejection uses config_error with a clear message and a
non-zero exit, so nothing is deleted. Normal DIST_DIRs still clean.

Tests (tests/cli.sh, registered in main): a HOME-as-DIST_DIR case (uses
a fake HOME under TEST_TMPDIR with a sentinel file, so a regression can
only touch the throwaway temp dir) and an empty-DIST_DIR case both assert
rejection and that nothing is removed.

Note: leftover staging artifacts on --clean are out of scope (task ln0).

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

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