Remove dialogue tone-of-voice system, add Gitea Actions full build, add venue cycling

- Delete Rules.Tone/TONE_NAMES, NpcProfile.tone_modifiers, tone params on
  NPCController.roll_reaction/apply_player_action; dialogue_lines flattened
  to Array[String]; HUD tone label, T binding, and hud.tone_prefix removed
- Docs updated everywhere (PLAN, README, DONE, MEMORY); PLAN section heading
  'Tone and Design Direction' -> 'Design Direction'
- Add .gitea/workflows/build.yml: checks job (import+tests) on push/PR; full
  build job (export templates, Linux/Windows/macOS exports, artifact upload,
  and tag-based Gitea release publish via GITEA_TOKEN) on tags/dispatch
- Remove old .github/workflows/ci.yml to avoid double runs
- Add venue cycling (V) across all three scenarios with hud.venue_switched
- Refresh README screenshots to match the new HUD
- 53/53 tests pass, boot smoke clean

src/test/tests/test_strings.gd

@@ -10,8 +10,8 @@ func test_strings_lookup() -> bool:
 	return a and b
 
 func test_strings_format() -> bool:
-	var a := TestUtils.check_eq(Strings.fmt("hud.tone_prefix", ["Firm"]), "Tone: Firm", "tone prefix formats")
-	var b := TestUtils.check_eq(Strings.fmt("react.comply", ["Tourist"]), "Tourist complies and steps back.", "reaction formats")
+	var a := TestUtils.check_eq(Strings.fmt("react.comply", ["Tourist"]), "Tourist complies and steps back.", "reaction formats")
+	var b := TestUtils.check_eq(Strings.fmt("hud.venue_switched", ["The Joke Shop"]), "Venue: The Joke Shop", "venue switch formats")
 	return a and b
 
 func test_strings_json_backed_all_resolve() -> bool:
@@ -26,7 +26,7 @@ func test_strings_json_backed_all_resolve() -> bool:
 func test_strings_cover_ui_keys() -> bool:
 	## Every key referenced by the HUD and game manager must exist.
 	var required := [
-		"hud.controls", "hud.tone_prefix", "hud.escalation_prefix", "hud.cooldown",
+		"hud.controls", "hud.escalation_prefix", "hud.cooldown", "hud.venue_switched",
 		"hud.aim_first", "hud.no_one_nearby", "hud.targeting", "hud.no_wand",
 		"hud.screen_first", "access.granted", "access.denied", "access.policy_satisfied",
 		"access.wrong_grant", "access.wrong_deny", "wand.admitted_prohibited",