## Implementation Plan: Fix Comment Permalinks on Feed/Card Pages

**Objective**  
Restore correct share‑button URLs for comments rendered in feed/card listings.  
No backend, JS, or CSS changes required — only four template files need a single‑line edit each.

### Changes

1. **`templates/_post_card.html` line ~47**  
   Replace  
   `{{ render_comment(c, 0) }}`  
   with  
   `{{ render_comment(c, 0, resolve_object_url("post", item.post["uid"])) }}`

2. **`templates/gists.html` line ~77**  
   Replace  
   `{{ render_comment(c, 0) }}`  
   with  
   `{{ render_comment(c, 0, resolve_object_url("gist", item.gist["uid"])) }}`

3. **`templates/news.html` line ~53**  
   Replace  
   `{{ render_comment(c, 0) }}`  
   with  
   `{{ render_comment(c, 0, resolve_object_url("news", item.article["uid"])) }}`

4. **`templates/projects.html` line ~89**  
   Replace  
   `{{ render_comment(c, 0) }}`  
   with  
   `{{ render_comment(c, 0, resolve_object_url("project", project["uid"])) }}`

   - `resolve_object_url` is already accessible as a Jinja global — no imports needed.
   - The `parent_url` argument is then correctly wired to the `data-share` attribute in `_comment.html`.

### Testing & Validation

- Run the existing test suite: `pip install -e '.[dev]' -q && make test-unit`  
- Run the linter: `pip install -q ruff && ruff check .`  
- All existing tests must pass; lint must produce zero errors.

### Definition of Done

- [ ] `templates/_post_card.html` updated with `parent_url` argument
- [ ] `templates/gists.html` updated with `parent_url` argument
- [ ] `templates/news.html` updated with `parent_url` argument
- [ ] `templates/projects.html` updated with `parent_url` argument
- [ ] Unit tests pass: `make test-unit` exits 0 with no failures
- [ ] Lint checks pass: `ruff check .` exits 0
- [ ] No new compilation or syntax errors in any changed file