fix(jira): address review comments on candidates-from-pr

- fetch_pr.py: guard against IndexError when gh stderr is whitespace-only
- SKILL.md: add jq + Python 3.10+ to prerequisites
- SKILL.md: 'highest' (not 'smallest') unreleased version for main/master,
  matching the command doc's wording
- SKILL.md, candidates-from-pr.md: tag bare fenced blocks (MD040)
- candidates-from-pr.md: align candidate `assignee` schema with SKILL.md
  (object with display_name/email, as returned by Jira)
- bump jira plugin to 0.4.8

Assisted-By: Claude <noreply@anthropic.com>
Signed-off-by: Enrique Llorente <ellorent@redhat.com>

Author: qinqon

.claude-plugin/marketplace.json

@@ -23,7 +23,7 @@
       "name": "jira",
       "source": "./plugins/jira",
       "description": "A plugin to automate tasks with Jira",
-      "version": "0.4.7"
+      "version": "0.4.8"
     },
     {
       "name": "ci",

docs/data.json

@@ -322,7 +322,7 @@
           "name": "Jira Status Analysis Engine"
         }
       ],
-      "version": "0.4.7"
+      "version": "0.4.8"
     },
     {
       "commands": [

plugins/jira/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "jira",
   "description": "A plugin to automate tasks with Jira",
-  "version": "0.4.7",
+  "version": "0.4.8",
   "author": {
     "name": "github.com/openshift-eng"
   }

plugins/jira/commands/candidates-from-pr.md

@@ -7,7 +7,7 @@ argument-hint: "<pr-url-or-number> [--repo <org/repo>] [--project <key>] [--targ
 jira:candidates-from-pr
 
 ## Synopsis
-```
+```text
 /jira:candidates-from-pr <pr-url-or-number> [options]
 ```
 
@@ -84,7 +84,7 @@ plugins/jira/skills/candidates-from-pr/SKILL.md
    - For OCPBUGS, target release is in `customfield_10855` (Target Version), not `fixVersions` (managed by release team — see `plugins/jira/reference/mcp-tools.md:295`). Query both for safety.
 
 6. **Build JQL** and search for candidate Jiras:
-   ```
+   ```jql
    project = <KEY>
      AND statusCategory != Done
      AND component in (<COMPONENT(s)>)
@@ -109,29 +109,29 @@ plugins/jira/skills/candidates-from-pr/SKILL.md
 ## Examples
 
 1. **Basic usage with a PR URL**:
-   ```
+   ```text
    /jira:candidates-from-pr https://github.com/openshift/ovn-kubernetes/pull/4567
    ```
 
 2. **Override the target release** (e.g. when triaging a backport before the base branch is final):
-   ```
+   ```text
    /jira:candidates-from-pr https://github.com/openshift/ovn-kubernetes/pull/4567 --target-release 4.18
    ```
 
 3. **Restrict to a specific component**:
-   ```
+   ```text
    /jira:candidates-from-pr 4567 --repo openshift/ovn-kubernetes \
      --component "Networking / ovn-kubernetes" --project OCPBUGS
    ```
 
 4. **Tighter results, JSON output for downstream tooling**:
-   ```
+   ```text
    /jira:candidates-from-pr https://github.com/openshift/ovn-kubernetes/pull/4567 \
      --limit 5 --min-score 60 --output json
    ```
 
 5. **Re-score even keys already mentioned in the PR description**:
-   ```
+   ```text
    /jira:candidates-from-pr https://github.com/openshift/ovn-kubernetes/pull/4567 --include-explicit
    ```
 
@@ -156,7 +156,7 @@ plugins/jira/skills/candidates-from-pr/SKILL.md
         "status": "New",
         "issuetype": "Bug",
         "priority": "Major",
-        "assignee": "Jane Doe",
+        "assignee": { "display_name": "Jane Doe", "email": "jane@example.com" },
         "components": ["..."],
         "target_release": "4.18",
         "score": 78,

plugins/jira/skills/candidates-from-pr/SKILL.md

@@ -42,7 +42,8 @@ All scripts read JSON on stdin or via `--` flags and write JSON/text to stdout.
 
 - `gh` CLI authenticated with read access to the target repo.
 - Jira MCP server configured (`plugins/jira/README.md`).
-- Python 3 (no third-party deps; standard library only).
+- Python 3.10+ (no third-party deps; standard library only).
+- `jq` CLI for JSON field extraction in shell snippets.
 
 ## Output Format
 
@@ -93,7 +94,7 @@ scripts/extract_jira_keys.py --projects "$PROJECTS" < pr.json > explicit_keys.js
 
 For each `key` in the output, call:
 
-```
+```text
 mcp__atlassian__jira_get_issue(
   issue_key=<KEY>,
   fields="summary,status,issuetype,components,fixVersions,customfield_10855,assignee"
@@ -113,11 +114,11 @@ scripts/derive_filters.py \
 
 If `filters.json.target_release_source == "needs_lookup"`:
 
-```
+```text
 mcp__atlassian__jira_get_project_versions(project_key=<KEY>)
 ```
 
-Pick the **smallest** version where `released == false` and rewrite `filters.json` with it (set `target_release_source = "project_versions"`).
+Pick the **highest** unreleased numeric version where `released == false` (the current development release for `main`/`master`) and rewrite `filters.json` with it (set `target_release_source = "project_versions"`).
 
 ### 4. Build JQL and search
 
@@ -127,7 +128,7 @@ scripts/build_jql.py --project "$PROJECT" < filters.json > jql.txt
 
 Run the search:
 
-```
+```text
 mcp__atlassian__jira_search(
   jql=<contents of jql.txt>,
   fields="summary,status,issuetype,priority,assignee,components,fixVersions,customfield_10855,description,updated,labels",

plugins/jira/skills/candidates-from-pr/scripts/fetch_pr.py

@@ -74,7 +74,8 @@ def main() -> None:
         # network glitch. Don't fail the whole pipeline — signals can still be
         # extracted from titles/bodies/file paths/commit messages.
         diff = ""
-        diff_unavailable_reason = (diff_err or "unknown error").strip().splitlines()[-1]
+        _err_lines = (diff_err or "").strip().splitlines()
+        diff_unavailable_reason = _err_lines[-1] if _err_lines else "unknown error"
 
     diff_lines = diff.splitlines()
     truncated = len(diff_lines) > args.diff_max_lines