Bug: extract_media() doesn't support .html/.htm extensions — inconsistent with extract_local_files()

Summary

After the "deliverable mode" PR (#27813, commit f2fdb9a1), MEDIA:/path/to/file.html no longer delivers the file as a native attachment. The path is left as literal text in the response instead.

Root Cause

The PR removed a |\S+ fallback catch-all from the extract_media() regex in gateway/platforms/base.py to reduce false positives. However, it did not add .html/.htm to the explicit extension list.

Meanwhile, the same PR did add .html/.htm to extract_local_files() (the bare-path detector). This means:

Both methods ultimately route through the same send_document() call, so there's no technical reason to exclude .html from extract_media().

Additionally, gateway/run.py has two inline _TOOL_MEDIA_RE regex patterns (around lines 16562 and 16858) used to scan tool results for MEDIA tags — these also lack .html/.htm.

Steps to Reproduce

1. Have Hermes running with Telegram connected.
2. Ask the agent to send an .html file using MEDIA: tag, e.g.:
   MEDIA:/home/user/report.html
3. Observe: the response text contains the literal MEDIA:/home/user/report.html string — no file is delivered.

Expected Behavior

The .html file should be delivered as a native document attachment, consistent with how extract_local_files() already handles bare .html paths.

Affected Files

• gateway/platforms/base.py — extract_media() regex (media_pattern)
• gateway/run.py — two _TOOL_MEDIA_RE inline regex patterns

Suggested Fix

Add html? to the extension alternatives in all three locations:

base.py — extract_media() (~line 2161):

- ...csv|apk|ipa)(?=...
+ ...csv|apk|ipa|html?)(?=...

run.py — _TOOL_MEDIA_RE (~lines 16563 and 16860):

- ...csv|apk|ipa))',
+ ...csv|apk|ipa|html?))',

Environment

• Hermes Agent commit: edb2d9105 (present in origin/main as of 2026-05-23)
• Introduced in: commit f2fdb9a1 ("feat(gateway): deliverable mode", 2026-05-18)