* docs: comprehensive fallback providers documentation
- New dedicated page: user-guide/features/fallback-providers.md covering
both primary model fallback and auxiliary task fallback systems
- Updated configuration.md with fallback_model config section
- Updated environment-variables.md noting fallback is config-only
- Fleshed out developer-guide/provider-runtime.md fallback section with
internal architecture details (trigger points, activation flow, config flow)
- Added cross-reference from provider-routing.md distinguishing OpenRouter
sub-provider routing from Hermes-level model fallback
- Added new page to sidebar under Integrations
* docs: comprehensive /background command documentation
- Added Background Sessions section to cli.md covering how it works
(daemon threads, isolated sessions, config inheritance, Rich panel
output, bell notification, concurrent tasks)
- Added Background Sessions section to messaging/index.md covering
messaging-specific behavior (async execution, result delivery back
to same chat, fire-and-forget pattern)
- Documented background_process_notifications config
(all/result/error/off) in messaging docs and configuration.md
- Added HERMES_BACKGROUND_NOTIFICATIONS env var to reference page
- Fixed inconsistency in slash-commands.md: /background was listed as
messaging-only but works in both CLI and messaging. Moved it to the
'both surfaces' note.
- Expanded one-liner table descriptions with detail and cross-references
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