fix: use bucket field in pr-fixup step 6 checks query

gh pr checks --json has no conclusion field. Switch
step 6 from --json name,state,conclusion with
select(.conclusion == "FAILURE") to --json
name,state,bucket with select(.bucket == "fail").

https://claude.ai/code/session_01B8wwrwR7vHqZWgVhRPz9pL

Author: claude

.claude/skills/pr-fixup/SKILL.md

@@ -164,8 +164,8 @@ loop iteration.
 List failed checks, then get the run ID:
 
 ```bash
-gh pr checks "$PR" --json name,state,conclusion \
-  -q '.[] | select(.conclusion == "FAILURE")'
+gh pr checks "$PR" --json name,state,bucket \
+  -q '.[] | select(.bucket == "fail")'
 ```
 
 ```bash

.github/AGENTS-PR-FIXUP.md

@@ -157,8 +157,8 @@ loop iteration.
 List failed checks, then get the run ID:
 
 ```bash
-gh pr checks "$PR" --json name,state,conclusion \
-  -q '.[] | select(.conclusion == "FAILURE")'
+gh pr checks "$PR" --json name,state,bucket \
+  -q '.[] | select(.bucket == "fail")'
 ```
 
 ```bash

.github/copilot-pr-fixup.md

@@ -150,8 +150,8 @@ loop iteration.
 List failed checks, then get the run ID:
 
 ```bash
-gh pr checks "$PR" --json name,state,conclusion \
-  -q '.[] | select(.conclusion == "FAILURE")'
+gh pr checks "$PR" --json name,state,bucket \
+  -q '.[] | select(.bucket == "fail")'
 ```
 
 ```bash

docs/development/pr-fixup-workflow.md

@@ -149,8 +149,8 @@ loop iteration.
 List failed checks, then get the run ID:
 
 ```bash
-gh pr checks "$PR" --json name,state,conclusion \
-  -q '.[] | select(.conclusion == "FAILURE")'
+gh pr checks "$PR" --json name,state,bucket \
+  -q '.[] | select(.bucket == "fail")'
 ```
 
 ```bash