docs/tools: Gitea token home & PR harness 검증 도구 개선

- docs/GITEA_TOKEN_HOME.md: 토큰 홈 설정 문서 업데이트
- docs/GITEA_TOKEN_HOME_RUNBOOK.md: 런북 보완
- docs/GITEA_VARIABLES_FAILURE_ANALYSIS.md: 실패 분석 문서 수정
- docs/GITEA_VARIABLES_RUNBOOK.md: 변수 런북 수정
- tools/validate_gitea_pr_harness_v1.py: PR 하네스 검증 스크립트 개선
- tools/validate_gitea_token_home_v1.py: 토큰 홈 검증 스크립트 개선

docs/GITEA_TOKEN_HOME.md

@@ -1,6 +1,6 @@
-# GITEA_TOKEN_HOME
+# GITEA_TOKEN_TAXBAIK
 
-`GITEA_TOKEN_HOME` is the local API token used to validate and optionally dispatch Gitea Actions from this workspace.
+`GITEA_TOKEN_TAXBAIK` is the local API token used to validate and optionally dispatch Gitea Actions from this workspace.
 
 ## Purpose
 
@@ -25,7 +25,7 @@ python tools/validate_gitea_token_home_v1.py --dispatch --workflow kis_data_coll
 
 ## Expected behavior
 
-- Without `GITEA_TOKEN_HOME`, the harness exits with `GITEA_TOKEN_HOME missing or empty`.
+- Without `GITEA_TOKEN_TAXBAIK`, the harness exits with `GITEA_TOKEN_TAXBAIK missing or empty`.
 - With a valid token, the harness should return `gate: PASS`.
 - With `--dispatch`, the harness posts a workflow dispatch and reports the latest run evidence.