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.

examples/evaluator-rag-prototype/scenario.json

@@ -22,12 +22,12 @@
     },
     {
       "kind": "github_pr",
-      "url": "https://github.com/affaan-m/everything-claude-code/pull/1815",
+      "url": "https://github.com/affaan-m/ECC/pull/1815",
       "purpose": "Example maintainer-owned stale salvage PR with attribution"
     },
     {
       "kind": "github_pr",
-      "url": "https://github.com/affaan-m/everything-claude-code/pull/1818",
+      "url": "https://github.com/affaan-m/ECC/pull/1818",
       "purpose": "Example gap pass classifying already-present and skipped stale work"
     }
   ],

examples/evaluator-rag-prototype/trace.json

@@ -18,8 +18,8 @@
       "evidence": [
         "docs/stale-pr-salvage-ledger.md",
         "docs/legacy-artifact-inventory.md",
-        "https://github.com/affaan-m/everything-claude-code/pull/1815",
-        "https://github.com/affaan-m/everything-claude-code/pull/1818"
+        "https://github.com/affaan-m/ECC/pull/1815",
+        "https://github.com/affaan-m/ECC/pull/1818"
       ]
     },
     {

examples/hud-status-contract.json

@@ -4,9 +4,9 @@
   "context": {
     "harness": "codex",
     "model": "gpt-5",
-    "repo": "affaan-m/everything-claude-code",
+    "repo": "affaan-m/ECC",
     "branch": "main",
-    "worktree": "/repo/everything-claude-code",
+    "worktree": "/repo/ECC",
     "sessionId": "session-active",
     "contextWindow": {
       "remainingPct": 62,
@@ -52,7 +52,7 @@
       {
         "name": "CI",
         "status": "pass",
-        "url": "https://github.com/affaan-m/everything-claude-code/actions"
+        "url": "https://github.com/affaan-m/ECC/actions"
       }
     ]
   },
@@ -106,7 +106,7 @@
       "latestStatusUpdateId": "status-update-id"
     },
     "GitHub": {
-      "repo": "affaan-m/everything-claude-code",
+      "repo": "affaan-m/ECC",
       "latestPullRequest": 1820
     },
     "handoff": {