Adds a tool to run jcpan -t on a curated registry of CPAN modules and
report installation/test status, XS detection, and regressions.

Features:
- Registry of 27 modules with category (known-good/partial/blocked)
- XS status tracking (pure-perl/java-xs/xs-with-pp-fallback/xs-required)
- Parses Test::Harness output for pass/fail counts
- Isolates target module results from dependency test output
- Regression detection via --compare with previous .dat files
- --quick mode for known-good regression checks

Usage: perl dev/tools/cpan_smoke_test.pl [--quick|--list] [Module...]

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Fork-based job pool allows running multiple jcpan -t processes
concurrently. Each child writes results to a temp file; parent
collects and reports as they finish.

Default remains sequential (--jobs 1) for safety since parallel
jcpan runs share ~/.perlonjava/lib/.

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… to smoke test

All three are pure-Perl modules. Parse::RecDescent depends on the
bundled Text::Balanced. Spreadsheet::WriteExcel would unlock the
ParseExcel skipped t/46_save_parser.t. Image::ExifTool already
passes 590/600 tests via its dedicated runner.

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Add 9 modules from CPAN top-20 (by favorites + reverse deps):
- Partial: JSON, Type::Tiny, List::MoreUtils, Template, Mojolicious
- Blocked: Plack, LWP::UserAgent, DBIx::Class, DBI

Create dev/modules/smoke_test_investigation.md documenting:
- Shared root causes (Clone::PP, MIME::Base64 $VERSION, Encode::Locale,
  PerlIO::encoding, exit codes)
- Per-module failure analysis for all 39 registered modules
- Prioritized fix order by impact

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P1: Create Clone::PP using Storable::dclone (unblocks HTTP::Message chain)
P2: Set MIME::Base64 $VERSION=3.16 in both .pm and Java backend
P4: Create PerlIO::encoding stub (helps IO::HTML and encoding-aware modules)

Additional fixes:
- Add $VERSION to bundled JSON.pm (fixes JSON CONFIG_FAIL in smoke test)
- Create Template::Stash::XS shim inheriting from Template::Stash
  (pure Perl fallback; Template still blocked by P6 regex bug)

Update investigation plan with P6 (regex engine \| alternation bug)
and progress tracking for completed fixes.

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…ipes

Two bugs fixed in RegexPreprocessor.java:

1. Quantifier validation used raw StringBuilder inspection to detect
   "quantifier follows nothing" after |. This failed for escaped \|
   (literal pipe) which also ends with | in the output buffer.
   Replaced with the existing lastWasQuantifiable flag which already
   correctly distinguishes alternation | (sets false) from escape
   sequences like \| (sets true).

2. Lookahead (?=), lookbehind (?<=, (?<!), negative lookahead (?!),
   and atomic groups (?>) were routed through handleRegularParentheses
   which only appended '(' and started recursive parsing at the '?'.
   The recursive handleRegex then treated '?' as a quantifier, causing
   "Quantifier follows nothing" errors. Fixed by appending the full
   group opener (e.g., "(?=") and starting recursive parsing after it.

   This also fixes incorrect capture group counting - these non-capturing
   constructs were being counted as capturing groups.

Patterns that now work:
- qr/\|\|?/             (escaped pipe with quantifier)
- /(a)(?=b)/            (lookahead after capture)
- /(.*)(?:::|')(?=.)/   (constant.pm pattern used by Template Toolkit)
- /(?<=a)b/             (lookbehind)
- /(?>a+)b/             (atomic group)

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… load

Previously Encode was pre-loaded at startup (GlobalContext.initialize),
which set %INC and prevented Encode.pm from executing.  This meant any
Perl-level wrapper code in Encode.pm was dead.

Changes:
- Defer Encode initialization to XSLoader::load (like TimeHiRes,
  UnicodeNormalize).  Encode.pm now runs normally when `use Encode`
  is called.
- Set Encode constructor to setInc=false so %INC is managed by
  require, not the Java module.
- Add a Perl-level find_encoding wrapper in Encode.pm that falls back
  to Encode::Alias::find_alias when the Java charset lookup fails.
  This enables coderef/regex/string aliases registered by modules
  like Encode::Locale (e.g. "locale" -> "UTF-8").
- Add resolve_alias() implementation.
- Per-name recursion guard prevents circular alias chains.

Unblocks: Encode::Locale, HTTP::Message chain (partially)

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Two bugs fixed:

1. exit() ignored $? modifications by END blocks (Perl 5 perlvar
   semantics). Now sets $? to the exit code before running END blocks,
   calls runEndBlocks(false) to preserve it, and reads $? back as the
   final exit code. This fixes Test::Needs (200/227 -> 227/227) where
   Test2's END block needs to override exit(0) with a failure code.

2. require error messages were missing "Compilation failed in require".
   Now builds the full Perl 5-compatible error (original + newline +
   "Compilation failed in require") and sets $@ before throwing, so
   eval{} sees the complete message.

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Implements HTMLParser.java providing:
- Full HTML::Entities decode_entities() and _decode_entities() with
  numeric (decimal/hex), named entity, surrogate pair, and prefix
  expansion support - ported from util.c
- UNICODE_SUPPORT() and _probably_utf8_chunk() stubs
- HTML::Parser construction (_alloc_pstate), 13 boolean accessors,
  handler registration, and basic event-driven HTML parsing
- Cross-package registration matching original Parser.xs layout

Unblocks: HTTP::Message (now PASS), Devel::Cover (now PASS),
HTML::Parser 190/415 tests passing.

Also comments out Mojolicious/Moose/Plack from smoke tests (timeout).

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All priority fixes P1-P7 now marked as DONE:
- P3: Encode::Alias find_encoding wrapper
- P5: exit() END block $? handling
- P6: Regex preprocessor lookaheads/escaped pipes
- P7: HTML::Parser Java XS backend Phase 1

Updated module status: HTTP::Message PASS, Devel::Cover PASS,
HTML::Parser 190/415, Test::Needs 227/227 PASS.
Added latest smoke test results table.

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… resolution

Previously, WriteMakefile() installed .pm files immediately during
Makefile.PL execution, before CPAN.pm could detect and install missing
dependencies. This meant modules were installed in a broken state when
deps were missing.

Now WriteMakefile() only writes MYMETA.yml (for dep detection) and a
Makefile with real cp commands. Actual file installation happens when
CPAN.pm runs 'make', after it has resolved and installed all
dependencies from MYMETA.yml.

Flow: Makefile.PL → MYMETA.yml written → CPAN detects deps → installs
deps → runs 'make' → files installed.

Also fixes IO::Socket::INET loading by replacing exists(&Errno::EINVAL)
(unsupported dynamic pattern) with eval { Errno::EINVAL() }.

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…lone

Storable::dclone does not preserve code references - it turns them into
broken strings where ref() returns empty and calling them fails with
Undefined subroutine errors.

This broke DateTime (via Specio which uses Clone::PP to clone attribute
definitions containing inline_generator coderefs).

The new implementation handles hashes, arrays, scalar refs, and circular
references. Code refs, globs, and regexps are returned as-is (shared)
since they are immutable.

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Two fixes in RegexPreprocessor.handleRegex():

1. When a quantifier follows a non-quantifiable item and the previous
   character in the output buffer is itself a quantifier (*, +, ?, }),
   emit "Nested quantifiers" instead of "Quantifier follows nothing".
   The lastWasQuantifiable check was short-circuiting before the nested
   quantifier detection could run, producing the wrong error message
   for patterns like a**, .{1}??, .{1}?+.

2. When stripping \G from the beginning of a group, also strip any
   following quantifier (?, *, +). Since \G is removed for Java regex
   compilation, its quantifier would be left dangling. For example,
   (\G?[ac])? is now correctly preprocessed to ([ac])?.

Fixes re/regexp.t (-4 across 6 variant files) and re/reg_mesg.t (-2)
regressions introduced in fb776af.

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