fix(agents): the claude projects root follows CLAUDE_CONFIG_DIR too (Issue #31, review)

stop resolves the uuid before it purges, through lib.sh's exported
CLAUDE_PROJECT_DIR and DiscoveryContext.claude_dir, both of which defaulted
to $HOME/.claude/projects. With CLAUDE_CONFIG_DIR alone the transcript under
<cfg>/projects was not found, so stop removed the row and purged nothing.
Both defaults are now ${CLAUDE_CONFIG_DIR:-<home>/.claude}/projects; an
explicit CLAUDE_PROJECT_DIR still wins.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/lib.sh

@@ -74,7 +74,8 @@ _MAM_DIALOG_TOKENS="${_MAM_MODAL_TOKENS}|${_MAM_HINT_TOKENS}"
 
 # Workspace-relative defaults with environment overrides (Phase Z)
 HOME_DIR="${HOME_DIR:-$HOME}"
-CLAUDE_PROJECT_DIR="${CLAUDE_PROJECT_DIR:-$HOME/.claude/projects}"
+# claude keeps projects/ under its config root, which CLAUDE_CONFIG_DIR moves (Issue #31).
+CLAUDE_PROJECT_DIR="${CLAUDE_PROJECT_DIR:-${CLAUDE_CONFIG_DIR:-$HOME/.claude}/projects}"
 if [ -z "${LOCAL_BIN:-}" ]; then
   if [ -x "$HOME_DIR/bin/herdr" ]; then
     LOCAL_BIN="$HOME_DIR/bin"