Closes the remaining gaps from PR #11562 that weren't covered by the
core SearXNG integration landed in #20823.
- optional-skills/research/searxng-search/ — installable skill with
SKILL.md (curl-based usage, category support, Python example) and
searxng.sh helper script for health checks and instance queries
- website/docs/user-guide/configuration.md — SearXNG added to the
Web Search Backends section (5 backends, backend table, per-capability
split config example, correct search-only note)
- website/docs/reference/environment-variables.md — SEARXNG_URL row
- website/docs/reference/optional-skills-catalog.md — searxng-search entry
The core SearXNG code, OPTIONAL_ENV_VARS, hermes tools picker, and tests
were already on main via #20823. This commit is purely additive docs +
the optional skill scaffold.
Credits from #11562 salvage:
@w4rum — original _searxng_search structure
@nathansdev — tools_config.py integration
@moyomartin — category support and result formatting
@0xMihai — config/env var approach
@nicobailon — skill and documentation structure
@searxng-fan — error handling patterns
@local-first — self-hosted-first philosophy and docs
