Update cpan_client.md - symbol table dereference bug is fixed

- Symbol table dereference (${ $Pkg::{NAME} }) now works correctly
- DateTime still blocked by namespace::autoclean dependency
- Updated investigation commands and next steps

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Co-Authored-By: Devin <noreply@cognition.ai>

Author: fglock

dev/design/cpan_client.md

@@ -530,7 +530,7 @@ cpan> install Module::Name
 
 ---
 
-## Phase 11: DateTime Dependency Investigation (2026-03-19)
+## Phase 11: DateTime Dependency Investigation (2026-03-19, UPDATED)
 
 ### Problem Statement
 
@@ -540,60 +540,57 @@ When running `jcpan install DateTime`, CPAN reports "DateTime is up to date (1.6
 
 However, when actually using DateTime, the CPAN-installed `DateTime.pm` fails to load due to missing dependencies.
 
-### Dependency Chain Analysis
+### Current Status (Updated 2026-03-19)
+
+**Symbol table dereference bug: FIXED**
+
+```perl
+# Now works correctly
+./jperl -e 'package Foo; our $VERSION = "1.0"; print ${ $Foo::{VERSION} }, "\n"'
+# Output: 1.0
+```
+
+**New blocker discovered**: Package::Stash::PP doesn't return a true value.
+
+```
+Could not find a suitable Package::Stash implementation:
+Can't locate Package/Stash/XS.pm
+Package/Stash/PP.pm did not return a true value
+```
+
+### Dependency Chain Analysis (Updated)
 
 ```
 DateTime.pm
 ├── namespace::autoclean 0.19
-│   └── B::Hooks::EndOfScope (XS - MISSING)
+│   └── namespace::clean
+│       └── Package::Stash
+│           └── Module::Implementation
+│               ├── ${ $stash{NAME} } - FIXED
+│               └── Package::Stash::PP - BROKEN (doesn't return true)
 ├── Params::ValidationCompiler 0.26 ✓
-├── Specio::Subs
-│   └── Specio
-│       └── Module::Implementation
-│           └── BUG: ${ $Package::{NAME} } returns empty
+├── Specio::Subs ✓ (after Package::Stash fix)
 ├── Try::Tiny ✓
 ├── DateTime::Locale 1.06
 ├── DateTime::TimeZone 2.44
 └── POSIX (built-in) ✓
 ```
 
-### Root Cause: Symbol Table Dereference Bug
-
-**Bug discovered**: `${ $Package::{NAME} }` returns empty instead of the variable value.
-
-```perl
-# PerlOnJava - BROKEN
-package Foo;
-our $VERSION = "1.0";
-my $glob = $Foo::{VERSION};
-print ${$glob};  # prints empty string (should print "1.0")
-
-# Perl5 - WORKS
-package Foo;
-our $VERSION = "1.0";
-my $glob = $Foo::{VERSION};
-print ${$glob};  # prints "1.0"
-```
-
-This bug blocks `Module::Implementation` which is used by `Specio` which is used by `DateTime`.
-
 ### Blocking Issues Summary
 
 | Issue | Module Affected | Status |
 |-------|-----------------|--------|
-| `${ $stash{NAME} }` dereference | Module::Implementation | **BUG - needs fix** |
-| B::Hooks::EndOfScope (XS) | namespace::autoclean | XS module - needs stub or Java impl |
+| ~~`${ $stash{NAME} }` dereference~~ | ~~Module::Implementation~~ | **FIXED** |
+| Package::Stash::PP doesn't return true | Package::Stash | **BUG - needs investigation** |
 
 ### Proposed Solutions
 
-#### Option A: Fix Symbol Table Dereference (Recommended)
+#### Option A: Fix Package::Stash::PP (Recommended)
 
-Fix the bug where `${ $glob_from_stash }` doesn't properly dereference to the scalar value.
+Investigate why Package::Stash::PP.pm doesn't return a true value.
 
 **Files to investigate:**
-- `RuntimeScalar.java` - scalar dereference
-- `RuntimeGlob.java` - glob handling
-- `GlobalContext.java` - symbol table access
+- `~/.perlonjava/lib/Package/Stash/PP.pm` - Check for compilation errors
 
 #### Option B: Create Bundled DateTime.pm
 
@@ -602,31 +599,20 @@ Create a simplified `DateTime.pm` in `src/main/perl/lib/` that:
 2. Uses our Java XS implementation or DateTime::PP
 3. Provides core DateTime functionality
 
-This is a fallback if Option A is too complex.
-
-#### Option C: Document DateTime as Requiring Manual Setup
-
-Document that DateTime requires additional setup and can't be installed via jcpan directly.
-
 ### Investigation Commands
 
 ```bash
-# Test symbol table dereference
+# Test symbol table dereference (NOW FIXED)
 ./jperl -e 'package Foo; our $VERSION = "1.0"; print ${ $Foo::{VERSION} }, "\n"'
+# Output: 1.0 (correct)
 
-# Compare with Perl5
-perl -e 'package Foo; our $VERSION = "1.0"; print ${ $Foo::{VERSION} }, "\n"'
-
-# Test Module::Implementation
-./jperl -e 'use Module::Implementation; print "OK\n"'
-
-# Test DateTime after fix
+# Test DateTime - still blocked by namespace::autoclean
 ./jperl -MDateTime -e 'print DateTime->now->ymd, "\n"'
+# Error: Can't locate namespace/autoclean.pm
 ```
 
 ### Next Steps
 
-1. **Investigate** `RuntimeScalar.java` and `RuntimeGlob.java` for scalar dereference from stash glob
-2. **Fix** the `${ $glob }` pattern when glob comes from `%Package::` stash
-3. **Test** Module::Implementation, Specio, DateTime in sequence
-4. **Alternative**: If fix is complex, create bundled DateTime.pm wrapper
+1. **Install namespace::autoclean dependencies** via jcpan to test further
+2. **If blocked by Package::Stash::PP**, investigate why modules ending with `sub foo { }` return undef
+3. **Alternative**: Create bundled DateTime.pm wrapper that skips heavy dependencies