Remove overly strict neutralization of issue-closing keywords in PR bodies

[Copilot]

neutralizeBotTriggers() was wrapping Fixes #NN, Closes #NN, Resolves #NN etc. in backticks across the sanitization pipeline, converting them to inline code and breaking GitHub's auto-close behavior on merge.

Changes

• sanitize_content_core.cjs: Remove neutralizeBotTriggers() call from sanitizeContentCore()
• sanitize_content.cjs: Remove neutralizeBotTriggers import and call from the selective-mention pipeline path
• Tests: Updated assertions in sanitize_content, sanitize_output, compute_text, and collect_ndjson_output tests to expect passthrough behavior

Before / After

# Before
"This fixes #123 and closes #456" → "This `fixes #123` and `closes #456`"

# After
"This fixes #123 and closes #456" → "This fixes #123 and closes #456"

Cross-repo reference restriction via GH_AW_ALLOWED_GITHUB_REFS / neutralizeGitHubReferences() is unaffected and remains available for controlling which owner/repo#N references are allowed.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/github/gh-aw/contents/.github%2Fworkflows%2Faudit-workflows.md
  • Triggering command: /opt/hostedtoolcache/node/24.13.0/x64/bin/node /opt/hostedtoolcache/node/24.13.0/x64/bin/node --conditions node --conditions development --experimental-import-meta-resolve --require /home/REDACTED/work/gh-aw/gh-aw/actions/setup/js/node_modules/vitest/suppress-warnings.cjs /home/REDACTED/work/gh-aw/gh-aw/actions/setup/js/node_modules/vitest/dist/workers/forks.js (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Filtering "Fixes #NN" etc seems to strict</issue_title>
<issue_description>GH-AW appears to suppress "Fixes #NN" and similar in generated PR bodies, converting it to fenced code. This seems too strict and makes the PRs much less useful.

Maybe there's a way to turn this off, but it doesn't seem essential for safety so feels like it should be off by default or just removed

Example fsprojects/FSharp.Data#1607</issue_description>

Comments on the Issue (you are @copilot in this section)

@pelikhan Investigate why "closes ..." was escaped.

• Fixes Filtering "Fixes #NN" etc seems to strict #17677

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