# texts rendering improvements

A batch of improvements to the HTML rendering layer of the texts service.

## Code cleanup

Removed three duplicate definitions found during a code review:

- `_h1(body)` existed in both `agents.py` and `html.py` — now defined once in `agents.py`, imported by `html.py`
- `_fmt_date(ts)` existed in both `html.py` and `resources.py` — now lives only in `html.py`
- `import time` appeared inside `page_recent_home()` despite being a top-level import

Row unpacking boilerplate `[(row[0], row[1], row[2], row[3]) for row in rows]` was simplified to `[tuple(row) for row in rows]` throughout `agents.py`.

## Markdown plugin expansion

The HTML renderer previously used mistune with no plugins beyond table support. The following plugins are now active:

| Plugin | Syntax | Output |
| --- | --- | --- |
| `table` | `\| col \| col \|` | pipe-delimited tables |
| `strikethrough` | `~~text~~` | deleted text |
| `footnotes` | `[^1]` / `[^1]: note` | numbered footnote references |
| `url` | bare `https://...` | auto-linked URLs |
| `task_lists` | `- [x]` / `- [ ]` | display-only checkboxes |
| `superscript` | `Hello^world^` | superscript |
| `subscript` | `H~2~O` | subscript |
| `ruby` | `[漢字(reading)]` | phonetic annotation |

CSS was added for tables (archival paper palette) and footnotes (separator line, muted colour).

## External link security

All links pointing to external URLs (`https?://`) now carry `rel="nofollow noopener noreferrer"`:

- `nofollow` removes the SEO incentive for link spam
- `noopener` prevents the linked page from accessing `window.opener`
- `noreferrer` suppresses the `Referer` header

Internal links (footnote anchors, relative paths) are unaffected.

## Math rendering

The mistune `math` plugin was evaluated but not enabled. It would require a client-side renderer (KaTeX ~1.4 MB self-hosted, or MathJax ~800 KB) or a server-side conversion step. Deferred until there is actual math content to render.