fix(naming): honor local *PKG::__ANON__ = 'name' in caller()/Sub::Util

[fglock]

Summary

Make caller() and Sub::Util::subname honor the
local *PKG::__ANON__ = 'name' idiom for naming anonymous subs.
This is used by SUPER.pm, Try::Tiny, namespace::clean, and several
Moose internals so that stack traces and SUPER-dispatch report a
meaningful name for anon subs.

Previously the idiom was silently lost and caller(0)[3] always
returned Pkg::__ANON__, which broke SUPER's t/bugs.t (3/6
failures) and consequently Test::MockModule (which couldn't
install) and any module that depends on it (e.g. DBIx::Retry).

Mechanism (see dev/modules/anon_sub_naming.md)

• RuntimeGlob gains a nameOverride string. Glob-as-scalar
  assignment (*foo = $string) records the override on the
  current glob in globalIORefs (looked up by name via a new
  non-vivifying GlobalVariable.peekGlobalIO helper), so the
  override correctly follows the fresh RuntimeGlob that
  local *FOO swaps in, not the lvalue captured before local.
• RuntimeCode.callerWithSub consults
  globalIORefs["Pkg::__ANON__"].nameOverride for any anon-sub
  frame (innermost via __SUB__, deeper frames via the stack-trace
  Pkg::__ANON__ marker). Sub::Name / set_subname's
  explicitlyRenamed path keeps winning, so a CV that was
  renamed via Sub::Name is unaffected by an outer local *__ANON__,
  matching real Perl.
• SubUtil.subname uses the same lookup.

This is option A from the design discussion in
dev/modules/anon_sub_naming.md ("glob indirection"), implemented
in a narrow, low-risk form that does not change the SCALAR-slot
semantics of *foo = "string" for any other use case.

Test plan

• make passes (full unit-test suite + build)
• SUPER t/bugs.t: 0/6 → 6/6 passing
• Test::MockModule installs cleanly; 103/103 tests pass
• DBIx::Retry chain unblocked: was bailing out at
  "Test::MockModule not found" (0 subtests run); now runs
  17/17 subtests (one remaining failure is an unrelated
  DBD::ExampleP issue)
• Sub::Name regression baseline diff is empty
  (dev/modules/anon_sub_naming_baseline.txt captured before
  the change)
• 10/10 targeted comprehensive cases match real Perl:
  plain anon, override, post-local reset, Sub::Name+local
  interaction, Sub::Util::subname inside local,
  package-qualified, nested anon frames, caller(N) from
  helpers, multi-call independence

Files

• src/main/java/org/perlonjava/runtime/runtimetypes/RuntimeGlob.java
  — nameOverride field, write path
• src/main/java/org/perlonjava/runtime/runtimetypes/GlobalVariable.java
  — peekGlobalIO helper
• src/main/java/org/perlonjava/runtime/runtimetypes/RuntimeCode.java
  — callerWithSub read path
• src/main/java/org/perlonjava/runtime/perlmodule/SubUtil.java
  — subname read path
• dev/modules/anon_sub_naming.md — design doc
• dev/modules/anon_sub_naming_baseline.txt — captured Sub::Name
  baseline (no diff after this change)

Generated with Devin