diff --git a/.claude/commands/pr.md b/.claude/commands/pr.md
index 1c5654c..3b9d9ec 100644
--- a/.claude/commands/pr.md
+++ b/.claude/commands/pr.md
@@ -37,6 +37,17 @@ Create pull requests for pgxntool and pgxntool-test changes, following the two-r
 - Bad: `"Add tests for pgxntool PR #31 (fix results ordering, whitespace, overrides)"`
 - Good: `"Fix results ordering, control file whitespace, ENABLE_* overrides"`
 
+## Closing GitHub Issues (CRITICAL)
+
+When a PR fixes one or more issues, give each its own `Fixes #N` / `Closes
+#N` / `Resolves #N` line in the PR body -- never combine them into a single
+comma-separated list like `Fixes #7, #14, #19`. **GitHub's auto-close only
+recognizes the first issue number in that pattern and silently drops every
+issue after it, with no error or warning.** This caused real drift in the
+2.2.0 release: one PR's `Fixes #7, #14, #19, #28, #50, #53` line only
+auto-closed #7 -- the other four issues were genuinely fixed but stayed
+open on GitHub until a manual post-release audit caught it.
+
 ## PR Description Guidelines
 
 **Think: "Someone in 2 years reading this in the commit log - what do they need to know?"**
diff --git a/.claude/skills/commit/guides/commit-message-format.md b/.claude/skills/commit/guides/commit-message-format.md
index 1417818..9453086 100644
--- a/.claude/skills/commit/guides/commit-message-format.md
+++ b/.claude/skills/commit/guides/commit-message-format.md
@@ -1,5 +1,28 @@
 # Commit Message Format Guide
 
+## Closing GitHub Issues (CRITICAL)
+
+When a commit fixes one or more issues, give each its own `Fixes #N` /
+`Closes #N` / `Resolves #N` line -- never combine them into a single
+comma-separated list like `Fixes #7, #14, #19`. **GitHub's auto-close only
+recognizes the first issue number in that pattern and silently drops every
+issue after it, with no error or warning.** This caused real drift in the
+2.2.0 release: one commit's `Fixes #7, #14, #19, #28, #50, #53` line only
+auto-closed #7 -- the other four issues were genuinely fixed but stayed
+open on GitHub until a manual post-release audit caught it.
+
+Correct:
+```
+Fixes #7.
+Fixes #14.
+Fixes #19.
+```
+
+Incorrect:
+```
+Fixes #7, #14, #19.
+```
+
 ## Item Ordering (CRITICAL)
 
 Order all items (changes, bullet points) by **decreasing importance**:
diff --git a/.claude/skills/release/SKILL.md b/.claude/skills/release/SKILL.md
index 2e704cd..451379b 100644
--- a/.claude/skills/release/SKILL.md
+++ b/.claude/skills/release/SKILL.md
@@ -319,6 +319,41 @@ only -- it's not a standing order for HISTORY.asc as a whole, and older,
 already-released sections are never touched. If an entry's category is
 genuinely unclear, ask the user rather than guessing.
 
+### Compile the complete fixed-issues line
+
+Independent of the individual STABLE entries above (which only narrate
+changes important enough to write up), compile one line listing *every*
+pgxntool issue actually closed by a commit in `release..HEAD` -- including
+issues covered by a change too minor to warrant its own STABLE entry (e.g.
+a one-line internal fix nobody bothered to narrate). This also catches
+issues GitHub's auto-close silently failed to close:
+
+1. For every PR merged in `release..HEAD`, read its own
+   `closingIssuesReferences` (`gh pr view <n> --json closingIssuesReferences`)
+   -- GitHub's own parsed understanding of which issues that merge closes.
+2. ALSO read the PR body directly for any other `Fixes #N` / `Closes #N` /
+   `Resolves #N` mentions not already present in that field. **GitHub only
+   recognizes the first issue in a single comma-separated line** like
+   `Fixes #7, #14, #19` -- every issue after the first is silently dropped,
+   with no error or warning. This is not hypothetical: 2.2.0 shipped with
+   issues #14, #19, #50, and #53 all genuinely fixed by one PR whose body
+   read `Fixes #7, #14, #19, #28, #50, #53` -- only #7 auto-closed, and the
+   other four sat open on GitHub until caught by a manual post-release audit.
+3. Union both sources per PR, then union across all PRs in the release.
+
+Append the result as a single line at the end of the STABLE section (after
+the last `==` entry, before the next version's heading), e.g.:
+
+```text
+Issues fixed in this release: #7, #14, #19, #28, #46, #50, #53, #54, #57, #62, #65
+```
+
+**Then check each listed issue's actual state on GitHub.** Any still open
+despite being genuinely fixed didn't actually auto-close -- close it now
+with a comment linking to the fixing PR, rather than deferring it to a
+later audit. Apply the same check to any pgxntool-test issue a paired PR's
+body referenced.
+
 ### Stamp the version
 
 Edit `../pgxntool/HISTORY.asc`: replace the `STABLE` heading with the version number.