feat: Upload recall results to GitHub Gist for shareable URL

[marknutter]

When running rlm recall, add an option to automatically upload the results to a GitHub Gist and return a shareable URL that renders nicely.

Use Case

After recalling memories/facts, you often want to share the results with others or reference them externally. A GitHub Gist provides:

• A permanent, shareable URL
• Markdown rendering out of the box
• Version history
• No auth needed to view (public gists)

Proposed Implementation

• Add --gist flag to rlm recall
• After recall completes, format results as clean Markdown
• Use gh gist create (or GitHub API directly) to upload
• Return the gist URL to the user
• Optional: --gist-private for secret gists (still accessible via URL but not listed)
• Include metadata header in the gist: query, timestamp, number of results, confidence scores

Example

rlm recall "What does Mark think about AI agents?" --gist
# Output:
# Found 12 relevant memories (avg confidence: 0.87)
# Gist created: https://gist.github.com/marknutter/abc123

Dependencies

• gh CLI (already available in our environment)
• Or use GitHub API directly with existing auth token