Add Stage-B BodyExtractor and FuncScanner to JoinIR VM bridge dispatch:
- Import stageb_body and stageb_funcscanner lowering functions
- Add routing for StageBBodyExtractorBox.build_body_src/2
- Add routing for StageBFuncScannerBox.scan_all_boxes/1
- Add try_run_stageb_body() and try_run_stageb_funcscanner() (lowering verification only)
Also cleanup unused imports in funcscanner_trim.rs and stage1_using_resolver.rs
Note: Stage-B functions use lowering verification pattern (like Stage-1)
because ArrayBox/MapBox args are not yet supported in JoinValue.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Phase 32 cleanup:
1. Delete legacy is_supported_case_a_loop function from loop_to_join.rs
- Replaced by is_supported_case_a_loop_view() in Phase 32 Step 3
2. Extract construct_simple_while_loopform helper to common.rs
- Unified LoopForm construction for simple while loops
- Parameters: entry_is_preheader (trim=true, stage1=false)
has_break (trim=true, stage1=false)
- Sets latch=body to satisfy is_simple_case_a_loop check
3. Update lowering modules to use the common helper:
- funcscanner_trim.rs: entry_is_preheader=true, has_break=true
- stage1_using_resolver.rs: entry_is_preheader=false, has_break=false
Test results: JSON snapshot 6/6 PASS, VM bridge trim 2/2 PASS
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Phase 31 Step 2 complete:
- skip_ws.rs: use LoopToJoinLowerer::lower_minimal_skip_ws_case_a()
- funcscanner_trim.rs: use LoopToJoinLowerer::lower_minimal_trim_case_a()
- funcscanner_append_defs.rs: use LoopToJoinLowerer::lower_minimal_append_defs_case_a()
- stage1_using_resolver.rs: use LoopToJoinLowerer::lower_minimal_stage1_case_a()
Eliminates direct generic_case_a calls, routing through unified box.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
