Extractive log fold

Create an additive rollup of raw wiki/log.md entries. Never modify, move, or delete child entries or their pages. Do not perform fold-of-folds or trigger a fold automatically.

Resolve the portable core from this skill's installation. Resolve the user vault by explicit --vault, CLAUDE_OBSIDIAN_VAULT, workspace config, then current-directory discovery. Never treat the plugin/product root as a vault.

PRODUCT_ROOT=/absolute/path/to/installed/claude-obsidian
CORE="$PRODUCT_ROOT/scripts/claude-obsidian.py"
test -f "$CORE"

Every ../wiki/references/ link in this file resolves the same way, relative to this skill's own directory under $PRODUCT_ROOT, never relative to the selected vault's wiki/ directory.