10: Warn for listcomp r=ltratt a=nanjekyejoannah Warnings for list comprehension, which include: - explicit tuple/parentheses for list items - leaking iterator variable. Co-authored-by: Joannah Nanjekye <jnanjekye@python.org>

Closes python/miss-islington#9

Co-authored-by: Jules <57632293+JuliaPoo@users.noreply.github.com>

Update sys module to conform with the PEP, add matching C API

Per docs/tier8-class-b-cport-migrate-arm-spec.md theologian 01:01:50Z + supervisor 01:02:46Z ADOPTED + supervisor 01:18:35Z + 03:44:19Z + 04:14:27Z (8-incident root-cause attribution to §3.5 restore-trap + b83f084 fix LIVE). Migrates HIRBuilder std::vector<ExceptionTableEntry> exception_table_ field to PhxExceptionTable (purpose-built typed-inline pure-C container in PhxHirBuilderState.exception_table_phx). Validates Pythia python#103 + python#94 (3) §5 forcing-decision MIGRATE-ARM via 1-pilot port (vs Phase 3's 4-Class-B-kept disposition). CONTAINER: PhxExceptionTable (builder_state_c.h): typed-inline data/count/capacity with 6 inline funcs (init/destroy/push/size/at/clear). Lazy-init, doubling realloc, free at HIRBuilder dtor. ExceptionTableEntry (builder_state_c.h): POD mirror of deleted C++ struct, fields flattened BCOffset → int + bool → unsigned char. C BODY PORTS (builder_state_c.c): hir_builder_state_init: also calls phx_exception_table_init hir_builder_state_destroy: NEW (calls phx_exception_table_destroy) parse_exception_table_c: pushes ExceptionTableEntry via phx_exception_table_push (replaces deleted push_cpp bridge) find_exception_handler_c: linear scan via phx_exception_table_size + at (replaces deleted size_cpp/entry_cpp bridges) C++ SHIM (transient compatibility per Phase A; Phase B deletes): HIRBuilder::parseExceptionTable → 1-line delegate to C body HIRBuilder::findExceptionHandler → C body returns index, shim converts via phx_exception_table_at preserving caller-contract HIRBuilder::buildHIRImpl translate-loop iterates PhxExceptionTable via size+at; .clear() goes to phx_exception_table_clear HIRBuilder::getSimpleExceptInfo wraps handler.target in BCOffset{} (now plain int post-C struct migration) emit_call_method_exception_handler_inline_c at builder.cpp:2883 still calls self->findExceptionHandler (KEPT shim — Phase B will rewire) DELETED: 3 _cpp bridge impls in builder.cpp (push/size/entry, ~37L) 3 friend decls in builder.h C++ struct ExceptionTableEntry in builder.h (5L) std::vector<ExceptionTableEntry> exception_table_ field in builder.h W45 §1-§2 fixture removals (3): the deleted bridges no longer have signatures to fuzz. Cumulative bridge-count delta: -3 (per Tier 8 spec §5 python#11 acceptance). Numstat (vs HEAD b83f084): Python/jit/hir/builder.cpp +21 -44 (-23 NET) Python/jit/hir/builder.h +14 -19 (-5 NET) Python/jit/hir/builder_state_c.c +30 -17 (+13 NET) Python/jit/hir/builder_state_c.h +103 -48 (+55 NET) scripts/w45_bridge_drift_falsifier.sh +0 -3 (-3 NET) TOTAL: NET +37L, bridge-count delta -3. Per Tier 8 spec §5 python#10 amendment (theologian 01:14:29Z): full Tier 8 endpoint ≤+0L cumulative is across all 4 Class B containers, not single pilot. exception_table_ pilot subtracts ~19% of Phase 3 +257L foundation cost; Phase 3 + Tier 8 Phase A cumulative now +257 + 37 = +294L. Apply mechanism: python single-process write (8-incident root cause was §3.5 restore-trap, NOT Write-tool-burst — but python single-process remains best practice per Pythia python#107 (4) isolation principle). Apply script: /tmp/apply_phase_a.py. EXPANDED PRE-COMMIT GATE per supervisor 01:17:23Z (testkeeper 04:24:49Z): Stage 1 compile-check: BUILD_EXIT=0 Stage 2 §3.5 BUILD MODE: 4/4 PASS, PhxExceptionTable INTACT post (§3.5 fix b83f084 VINDICATED) Stage 3 per-bench gate: GEO 1.27x, all 4 floor criteria PASS §5 forcing-decision MIGRATE-ARM EMPIRICALLY VALIDATED via this pilot: exception_table_ migrated to PhxArray-equivalent pure-C container without C++-side-keep dependency in C-side reads. Pattern propagatable to remaining 3 Class B containers (block_map_, temps_, static_method_stack_) in future Tier 8 batches per spec §1.1 container-shape transferability caveat. Phase B follow-up commit (NEXT) deletes C++ shims + rewires the remaining caller at builder.cpp:2883 per Tier 8 spec §5 python#5. Authorization: supervisor 03:44:19Z + 04:14:27Z; theologian 03:33:50Z patch-apply hybrid + 03:54:15Z content-trigger refinement (later attributed to §3.5 trap, not content) + 04:14:27Z fix directive. Cross-link: 8 incidents resolved via b83f084 §3.5 restore-trap fix. Pythia python#105 'fever has name infection still spreads' RESOLVED — fever was self-inflicted instrumentation. W48 spec marked CANCELLED post- this-commit per supervisor 04:14:27Z cascade re-retract.