Add /ce:refresh to sync reviewer personas from external repos

A new skill and bash script that fetches reviewer .md files from
configured Git repos into the plugin's agents/review/ directory.

Features:
- User config at ~/.config/compound-engineering/reviewer-sources.yaml
  (auto-created on first run with sensible defaults)
- Interactive menu: sync, edit config, or type natural language changes
- Multiple sources with priority ordering (first listed wins)
- Per-source except lists to skip specific reviewers
- gh CLI with git clone fallback
- Detailed per-source summary written to a file for verbatim display
- Compatible with macOS bash 3 (no associative arrays)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jcasimir

mise.toml

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+[tools]
+bun = "latest"

plugins/compound-engineering/skills/refresh/SKILL.md

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+---
+name: ce:refresh
+description: "Sync reviewer personas from external Git repos into the local plugin. Reads sources from reviewer-registry.yaml, fetches .md files, and places them in agents/review/. Use when setting up the plugin for the first time, after updating your reviewer repo, or to pull in new reviewer personas."
+---
+
+# Refresh Reviewers
+
+Syncs reviewer persona files from external Git repositories into the plugin's `agents/review/` directory.
+
+## Step 1: Locate plugin
+
+Find the plugin's install location in the Claude plugin cache:
+
+```bash
+PLUGIN_DIR=$(find "$HOME/.claude" "$HOME/.claude-"* -path "*/compound-engineering/*/agents/review" -type d 2>/dev/null | head -1 | sed 's|/agents/review$||')
+```
+
+Fall back to relative path if not found (e.g., running from source repo):
+
+```bash
+PLUGIN_DIR="${PLUGIN_DIR:-plugins/compound-engineering}"
+```
+
+## Step 2: Interactive source configuration
+
+Read the user's source config at `~/.config/compound-engineering/reviewer-sources.yaml`. If it doesn't exist, the sync script will create it on first run — skip this step and go directly to Step 3.
+
+If the file exists, parse it and present the current sources to the user like this:
+
+List the current sources, then present three options using AskUserQuestion:
+
+```
+Current sources:
+  - jsl-reviewers (JumpstartLab/ce-reviewers-jsl@main)
+  - ce-default (JumpstartLab/ce-reviewers@main)
+
+1. Sync now
+2. Edit config file
+3. Or type a request (e.g., "add owner/repo", "remove ce-default")
+```
+
+Handle the response:
+- **1 / Sync now** — proceed to Step 3.
+- **2 / Edit config file** — open `~/.config/compound-engineering/reviewer-sources.yaml` via Bash: `${EDITOR:-$(command -v code 2>/dev/null || echo nano)} ~/.config/compound-engineering/reviewer-sources.yaml`. After the editor, re-read the file and present the menu again.
+- **Anything else** — interpret as a natural language request to modify the config (add a source, remove one, change a branch, add an except entry, etc.). Edit the YAML accordingly, then present the menu again.
+
+## Step 3: Sync
+
+Run the sync script:
+
+```bash
+bash "$PLUGIN_DIR/skills/refresh/sync-reviewers.sh" \
+  "$PLUGIN_DIR/skills/ce-review/references/reviewer-registry.yaml" \
+  "$PLUGIN_DIR/agents/review"
+```
+
+## Step 4: Show results
+
+The script writes a summary to `~/.config/compound-engineering/last-refresh-summary.md`. Read that file and **output its contents to the user exactly as written**. The summary is already formatted as markdown — do not summarize, paraphrase, or reformat it. Just show it.
+
+## Source YAML Format
+
+```yaml
+sources:
+  - name: my-reviewers
+    repo: username/repo-name
+    branch: main
+    path: .
+
+  - name: community-reviewers
+    repo: SomeOrg/ce-reviewers
+    except:
+      - kieran-python-reviewer
+```
+
+| Field | Required | Default | Description |
+|-------|----------|---------|-------------|
+| `name` | yes | — | Label for this source |
+| `repo` | yes | — | GitHub owner/repo |
+| `branch` | no | `main` | Branch to fetch from |
+| `path` | no | `.` | Directory in the repo containing .md files |
+| `except` | no | `[]` | Reviewer filenames (without .md) to skip |
+
+## Conflict Resolution
+
+Sources listed first have higher priority. If two sources have a file with the same name, the first source's version is kept.
+
+## Requirements
+
+- `gh` CLI (preferred) or `git` for fetching
+- `python3` for YAML parsing