chore: retire the Everything Claude Code name, ECC only (#3330)

* chore: retire the Everything Claude Code name, ECC only

Replace the expanded product name and the everything-claude-code slug
with ECC across READMEs, translated docs, harness folders, skills,
commands, scripts and examples. Repo URLs now point at affaan-m/ECC.

Rename repo-internal artifacts to ecc forms (ecc-conventions skill,
ecc-guardrails, ecc-research-playbook, ecc-team-config, ecc-instincts
with ecc-* ids) and update .claude/ecc-tools.json.

Legacy install ids, plugin dirs, package names and MCP prefixes stay
where existing installs resolve against them. The codex global-state
check and harness-audit repo detection accept the new name first and
the legacy one as a fallback. The Discord bot prefers ~/GitHub/ECC and
falls back to the nested legacy checkout path.

Refresh the skill-triggers registryDigest for the changed skill text.

* fix(ecc-tools): drop managed paths to the removed Claude repo skill

.claude/skills/<repo-skill>/SKILL.md was deleted in #2770 but stayed listed in
ecc-tools.json and the team config. Remove those entries and point the Claude
Code adapter at the existing .agents/skills/ecc-conventions/SKILL.md.

.trae/README.md

@@ -1,6 +1,6 @@
-# Everything Claude Code for Trae
+# ECC for Trae
 
-Bring Everything Claude Code (ECC) workflows to Trae IDE. This repository provides custom commands, agents, skills, and rules that can be installed into any Trae project with a single command.
+Bring ECC workflows to Trae IDE. This repository provides custom commands, agents, skills, and rules that can be installed into any Trae project with a single command.
 
 ## Quick Start
 

.trae/README.zh-CN.md

@@ -1,6 +1,6 @@
-# Everything Claude Code for Trae
+# ECC for Trae
 
-为 Trae IDE 带来 Everything Claude Code (ECC) 工作流。此仓库提供自定义命令、智能体、技能和规则，可以通过单个命令安装到任何 Trae 项目中。
+为 Trae IDE 带来 ECC 工作流。此仓库提供自定义命令、智能体、技能和规则，可以通过单个命令安装到任何 Trae 项目中。
 
 ## 快速开始
 

.trae/install.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 #
 # ECC Trae Installer
-# Installs Everything Claude Code workflows into a Trae project.
+# Installs ECC workflows into a Trae project.
 #
 # Usage:
 #   ./install.sh              # Install to current directory

.trae/uninstall.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 #
 # ECC Trae Uninstaller
-# Uninstalls Everything Claude Code workflows from a Trae project.
+# Uninstalls ECC workflows from a Trae project.
 #
 # Usage:
 #   ./uninstall.sh              # Uninstall from current directory