docs: Clarify PR review range handling in auditor documentation

- Updated `SKILL.md` and `review-checklist.md` to replace `origin/<base>`
  references with `<base_remote>/<base>` for generality.
- Adjusted `review_range.sh` usage example to illustrate `upstream/main..HEAD`.

Assisted-by: Codex

Author: datalogics-kam

.agents/skills/pr-review-auditor/SKILL.md

@@ -20,7 +20,7 @@ policy precedence: `*GUIDELINES*.md` before `AGENTS.md`.
 - checked-out branch,
 - PR number and base branch (via `gh pr view`),
 - merge-base commit,
-- review range (`origin/<base>..HEAD`),
+- review range (`<base_remote>/<base>..HEAD`),
 - changed files,
 - available policy files (`*GUIDELINES*.md`, `AGENTS.md`).
 

.agents/skills/pr-review-auditor/references/review-checklist.md

@@ -8,7 +8,7 @@
 
 ## Review Scope
 
-- Determine PR base branch and audit `origin/<base>..HEAD`.
+- Determine PR base branch and audit `<base_remote>/<base>..HEAD`.
 - Review full commit messages, changed files, and relevant patches.
 - Focus on behavior, CI impact, tests, then style.
 

.agents/skills/pr-review-auditor/scripts/review_range.sh

@@ -4,7 +4,7 @@ set -euo pipefail
 range="${1:-}"
 if [[ -z "${range}" ]]; then
     echo "usage: $(basename "$0") <git-range>" >&2
-    echo "example: $(basename "$0") origin/main..HEAD" >&2
+    echo "example: $(basename "$0") upstream/main..HEAD" >&2
     exit 1
 fi