[jeyrb]

In Home Assistant 2026.11, HACS became the built-in Marketplace (Settings → Marketplace). Supernotify's docs already say this, but Auto Arm's still describe HACS only.

• README: the HACS badge becomes a Marketplace badge, and the "HACS" heading in the product list becomes "Home Assistant Marketplace"
• quick_start.md: install from the Marketplace, with HACS kept as the route before 2026.11
• configuration/removal.md: uninstall from the Marketplace (including Delete and uninstall), with the HACS steps kept for older versions
• help/ai_help.md: drops "HACS" from the search hint

The wording follows supernotify's quick_start/removing.md. The unused [HACS] link definitions in two pages are left alone.

properdocs build fails in the review sandbox with a config-parsing error, on unchanged main as well, so CI's docs build is the real check.

Why: ecosystem review 2026-11

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[jeyrb]

CI note: test (2026.5, 3.14, 2026.5.*, true) fails, but not because of this PR. The diff is docs-only, and the same job is red on main (a26ca98). Two tests in tests/autoarm/test_calendar_options.py fail only against the HA 2026.5 floor: test_options_flow_calendar_section (regex didn't match) and test_options_flow_rejects_invalid_pattern (InvalidData: Schema validation failed @ data['calendar_options']['calendar_match_rules']). Both pass on 2026.11. This looks like schema-validation error text that differs between HA versions. No fix exists yet; it's tracked in rhizomatics/hq-private#92.

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