notifications.html: add Home Assistant section with two collapsible
blocks — Connection (HA URL + Long-Lived Access Token) and Inbound
webhook (webhook ID with endpoint URL hint showing the username).
Token field uses keep-existing pattern (blank = no change).
settings.py: wire ha_url, ha_token, ha_webhook_id through
_notifications_page() template substitution and save_notifications()
POST handler. Preserves existing HA config fields (persona, tier,
role, tools) on save.
TODO__Agents.md: add Home Assistant integration planning section
(event design, richer payload template, HA API tools).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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