feat: add repo command for cross-repository exploration

.claude/commands/ask-repo.md

@@ -0,0 +1,42 @@
+# Repository Explorer
+
+Spawn a sub-agent to explore another repository without polluting the current context.
+
+## Usage
+
+```
+/ask-repo <alias> "<prompt>"
+```
+
+Examples:
+- `/ask-repo pay-core "how is authentication implemented?"`
+- `/ask-repo data-lake "find the Glue table definitions"`
+
+## Arguments
+
+$ARGUMENTS
+
+## Instructions
+
+1. Parse the arguments to extract the repo alias (first word) and the prompt (remaining text, quotes optional)
+
+2. Read `~/.claude/repos.json` to get the repository mappings
+
+3. Look up the provided alias in the mappings:
+   - If not found, list available aliases and ask the user to pick one
+   - If found, get the full path
+
+4. Use the Task tool to spawn an Explore agent:
+   - Set `subagent_type` to `Explore`
+   - Set the prompt to include:
+     - The working directory path from repos.json
+     - The user's question/prompt
+     - Instruction to be concise and return only relevant findings
+   - Use `model: haiku` for quick lookups, or `sonnet` for deeper analysis
+
+5. Return a concise summary of what was found, including:
+   - Key file paths (relative to the repo)
+   - Brief explanation of findings
+   - Code snippets only if directly relevant
+
+Keep the response focused - the goal is minimal context pollution.