Add games2tools validation report confirming Tool filter, game->tool roundtrip params, tools return line, and 11/11 launchable games mapped with toolHints.

Author: DavidQ

docs/dev/reports/games2tools_roundtrip_validation.txt

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+Games2Tools Validation Report
+Generated: 2026-04-24T23:17:27.512Z
+
+[x] Games hub includes Tool filter control (games-filter-tool).
+[x] Games index rendering supports tool token filtering and query prepopulation (?tool=<toolId>).
+[x] Game cards render Tool Roundtrip Links from metadata toolHints.
+[x] Roundtrip links pass gameId, gameTitle, gameHref, workspaceHref, returnTo query params.
+[x] Tools shell renders Game Source return line when launched from game links.
+
+Launchable games: 11
+Launchable games with toolHints: 11
+Launchable games missing toolHints: 0
+
+Launchable game IDs with toolHints:
+- Bouncing-ball (3 tools)
+- Breakout (3 tools)
+- SolarSystem (3 tools)
+- GravityWell (3 tools)
+- Pong (3 tools)
+- Asteroids (3 tools)
+- SpaceInvaders (3 tools)
+- SpaceDuel (3 tools)
+- AITargetDummy (3 tools)
+- Pacman (3 tools)
+- vector-arcade-sample (3 tools)
+
+Launchable game IDs missing toolHints: