bug: prr submit fails with 'path does not start with slash'

[TineoC]

Description

prr submit fails with Error: Invalid URI / path does not start with slash on every submission attempt. The error comes from http::Uri::builder().path_and_query() which requires the path component to start with / per RFC 3986.

Root cause

In src/prr.rs, both submit_review() and submit_file_comment() construct API paths without a leading slash:

• Line 391: format!("repos/{}/{}/pulls/{}/reviews", ...)
• Line 441: format!("repos/{}/{}/pulls/{}/comments", ...)

These produce paths like repos/owner/repo/pulls/123/reviews which lack the required / prefix.

Fix

Add a leading / to both format strings:

- format!("repos/{}/{}/pulls/{}/reviews", owner, repo, pr_num)
+ format!("/repos/{}/{}/pulls/{}/reviews", owner, repo, pr_num)

- format!("repos/{}/{}/pulls/{}/comments", owner, repo, pr_num)
+ format!("/repos/{}/{}/pulls/{}/comments", owner, repo, pr_num)

Workaround

Pipe the JSON from prr submit --debug 2>/dev/null into gh api --method POST repos/.../pulls/.../reviews --input - to bypass prr broken HTTP client.