chore(store): refresh Play listing — drop dated 'GPT-4', ASO keyword pass (#83)

* chore(store): refresh Play listing — drop dated "GPT-4", ASO keyword pass

distribution/play-listing.md is the canonical copy-paste source for the
Play Console listing (per distribution/strategy.md). It still named
"GPT-4" and was missing the directory picker and reasoning-effort
features shipped since. Rewrite title/short description/full
description to be model-agnostic ("Claude, GPT, Gemini, or any other
model") so it stops dating itself, add the two new feature bullets, a
connection-options section, and screenshot captions.

Also fixes the same stale "GPT-4" mention in the orphaned
distribution/play-store-listing.md (marked superseded — it was never
merged back into play-listing.md), distribution/aso-audit.md's
recommended-copy example, and distribution/app-store-listing.md for
cross-store consistency.

fastlane/metadata/android/en-US/full_description.txt is untouched: it
already had no stale model name, and it is shared with the F-Droid
auto-pull (plain text + AntiFeatures disclosure required by mainline
F-Droid) so it must not get Play-style HTML/marketing copy. Only
title.txt and short_description.txt (Play/App-store-only fields, not
read by F-Droid's metadata.yml which sets AutoName explicitly) were
aligned with the new short description.

* docs(store): correct full-description char count annotation (3410→3366)

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Co-authored-by: engineer <engineer@gray-knight-m1.local>

distribution/app-store-listing.md

@@ -54,7 +54,7 @@ WHO IT'S FOR
 
 WHAT IT IS NOT
 
-• Not an AI model — you bring your own opencode server (which connects to Claude, GPT-4, Gemini, or local models via your API keys)
+• Not an AI model — you bring your own opencode server (which connects to Claude, GPT, Gemini, or local models via your API keys)
 • Not a code editor — pairs with your existing IDE and terminal workflow
 • Not a subscription service — the app is free and open source