shipyard: move 8 resolved issues from Open to Closed (bookkeeping)

ISSUE-014, 015, 016, 017, 018, 019, 020, 024 were all marked
Resolved in their bodies but listed under ## Open. Moved to ## Closed
for consistency with their actual status. No semantic change — pure
section reorg.

Open section is now empty (_No open issues._) now that all sibling-repo
items have been migrated upstream and all resolved items are filed
correctly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: blehnen

.shipyard/ISSUES.md

@@ -2,6 +2,10 @@
 
 ## Open
 
+_No open issues._
+
+## Closed
+
 ### ISSUE-019: Missing SUMMARY-1.1.md artifact for Plan 1.1 (LiteDb history tests)
 - **Severity:** Important
 - **Source:** Plan 1.1 Review
@@ -81,8 +85,6 @@
 - **Remediation:** Store the provider on `ActivitySourceWrapper` (e.g., `private readonly TracerProvider _provider`) and dispose it in `Dispose()` before the source. Replace the `Thread.Sleep(2000)` with `_provider?.ForceFlush(2000)` for deterministic flushing.
 - **Resolution:** Stored TracerProvider on ActivitySourceWrapper, replaced Thread.Sleep(2000) with ForceFlush(2000) + Dispose(). Null-safe when TraceSettings.Enabled is false.
 
-## Closed
-
 ### ISSUE-031: Transitive `System.Security.Cryptography.Xml 8.0.2` high-severity CVE (NU1903) via TaskScheduler integration tests
 - **Severity:** High (CVE, but surface is test-only)
 - **Source:** Phase 2 (dependency-refresh milestone) — surfaced during Debug build after bumping low-risk packages