fix: return null from resolveLinkedIssue when no skill label is present #18

	name: Bot - On PR Close

	# Runs on PR close (merged). Executes issue recommendation workflow:
	# determines completed issue difficulty, finds next/same/fallback issues,
	# and posts a recommendation comment via bot-on-pr-close.js.
	on:
	pull_request_target:
	types: [closed]

	permissions:
	pull-requests: write
	issues: write
	contents: read

	jobs:
	on-pr-close:
	runs-on: hiero-client-sdk-linux-large
	if: github.event.pull_request.merged == true

	concurrency:
	group: on-pr-close-${{ github.event.pull_request.number }}
	cancel-in-progress: true

	steps:
	- name: Harden Runner
	uses: step-security/harden-runner@fe104658747b27e96e4f7e80cd0a94068e53901d # v2.16.1
	with:
	egress-policy: audit

	- name: Checkout Repository
	uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
	with:
	ref: ${{ github.event.repository.default_branch }}

	- name: Run PR Close Handler
	uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
	with:
	script: \|
	const script = require('./.github/scripts/bot-on-pr-close.js');
	await script({ github, context });

Provide feedback