docs: update App::perlbrew plan -- 71/73 tests pass

[fglock]

Summary

• Re-investigated the 7 remaining App::perlbrew test failures from Phase 7.4
• Found that 5 of 7 were stale-build artifacts (Module::Build::Tiny not installed to ~/.perlonjava/lib). After a fresh build, these all pass
• Updated status from 66/73 to 71/73 tests passing
• All CPAN dependencies (local::lib, Path::Class, Capture::Tiny, Test2::Mock, Test2::Plugin::IOEvents) install from CPAN and work correctly -- no PerlOnJava-specific versions needed

Remaining 2 failures

Test	Root Cause	Complexity
command-info.t (3/4 subtests)	jperl -V missing Compiled at line that perlbrew parses	Easy fix in ArgumentParser.java
installation2.t (1/1 subtest)	DESTROY not implemented -- Test2::Mock cannot restore methods when mock goes out of scope	Systemic (needs DESTROY)

Added to plan

• Phase 9.1: detailed fix plan for adding Compiled at to jperl -V output
• Phase 9.2: analysis of DESTROY limitation and possible approaches (PhantomReference, scope-based cleanup, or accept limitation)

Test plan

• Verified 71/73 pass via jperl Build test in App::perlbrew build directory
• Confirmed root causes for both remaining failures with reproduction scripts

Generated with Devin

[fglock]

Superseded by #459 which includes the actual code fix for command-info.t