Hoist Python report and Markdown output primitives

[doublemover]

Parent inventory: #8108
Blocked by: #8119, #8120

Objective

Create small report/Markdown/file-output primitives for build and publisher scripts without creating a publisher framework.

Shared Module Specification

• Add scripts/objc3c_tooling/reports.py.
• Expose helpers for Markdown headings, bullets, tables, table-pipe escaping, artifact path rendering, and common summary/footer sections.
• Expose write_outputs-style primitives only for common artifact-write shapes.
• Keep business logic and report-specific schema construction local.
• Reuse shared path, JSON, file-output, and subprocess helpers.

Migration Checklist

• Migrate render_markdown and render_markdown_report only where primitives reduce duplication without hiding content.
• Migrate build_summary/build_summary_payload scaffolding only where schemas match.
• Migrate repeated write_outputs artifact write shapes.
• Preserve output file names, JSON schemas, Markdown structure, and public report text unless intentionally fixing a validated bug.

Complete Replacement Inventory

• render_markdown - 21 definition(s)/local occurrence(s) to replace or explicitly document as intentionally local if semantics differ.
  • scripts/build_objc3c_claimability_dashboard_release_blocker_contract.py:179
  • scripts/build_objc3c_cross_module_semantic_contracts_diagnostics.py:276
  • scripts/build_objc3c_effects_ownership_semantic_model.py:358
  • scripts/build_objc3c_manifest_object_ir_truth_gate.py:447
  • scripts/build_objc3c_object_model_ir_lowering_closure.py:338
  • scripts/build_objc3c_parser_container_layout_closure.py:123
  • scripts/build_objc3c_parser_draft_syntax_conformance.py:293
  • scripts/build_objc3c_parser_draft_syntax_surface.py:169
  • scripts/build_objc3c_runtime_backed_semantics_closure.py:393
  • scripts/build_objc3c_support_classification.py:344
  • scripts/build_objc3c_type_semantic_model_closure.py:344
  • scripts/check_activation_triggers.py:334
  • scripts/check_bootstrap_readiness.py:227
  • scripts/check_objc3c_public_claim_drift.py:420
  • scripts/extract_open_blockers.py:572
  • scripts/extract_open_issues.py:202
  • scripts/extract_remaining_tasks.py:610
  • scripts/generate_compiler_dispatch_plan.py:220
  • scripts/generate_execution_microtasks.py:228
  • scripts/generate_quality_gate_decision.py:674
  • scripts/render_objc3c_public_command_surface.py:47
• render_markdown_report - 4 definition(s)/local occurrence(s) to replace or explicitly document as intentionally local if semantics differ.
  • scripts/audit_objc3c_planning_publication.py:67
  • scripts/run_activation_preflight.py:997
  • scripts/run_bootstrap_readiness.py:469
  • scripts/run_open_blocker_audit.py:784
• build_summary - 12 definition(s)/local occurrence(s) to replace or explicitly document as intentionally local if semantics differ.
  • scripts/build_objc3c_claimability_dashboard_release_blocker_contract.py:84
  • scripts/build_objc3c_cross_module_semantic_contracts_diagnostics.py:182
  • scripts/build_objc3c_effects_ownership_semantic_model.py:264
  • scripts/build_objc3c_manifest_object_ir_truth_gate.py:329
  • scripts/build_objc3c_object_model_ir_lowering_closure.py:220
  • scripts/build_objc3c_parser_container_layout_closure.py:62
  • scripts/build_objc3c_parser_draft_syntax_conformance.py:151
  • scripts/build_objc3c_parser_draft_syntax_surface.py:107
  • scripts/build_objc3c_runtime_backed_semantics_closure.py:315
  • scripts/build_objc3c_support_classification.py:253
  • scripts/build_objc3c_type_semantic_model_closure.py:248
  • scripts/check_objc3c_public_claim_drift.py:334
• build_summary_payload - 3 definition(s)/local occurrence(s) to replace or explicitly document as intentionally local if semantics differ.
  • scripts/run_activation_preflight.py:849
  • scripts/run_bootstrap_readiness.py:327
  • scripts/run_open_blocker_audit.py:725
• write_outputs - 10 definition(s)/local occurrence(s) to replace or explicitly document as intentionally local if semantics differ.
  • scripts/build_objc3c_claimability_dashboard_release_blocker_contract.py:193
  • scripts/build_objc3c_cross_module_semantic_contracts_diagnostics.py:301
  • scripts/build_objc3c_effects_ownership_semantic_model.py:383
  • scripts/build_objc3c_object_model_ir_lowering_closure.py:365
  • scripts/build_objc3c_parser_container_layout_closure.py:148
  • scripts/build_objc3c_parser_draft_syntax_conformance.py:321
  • scripts/build_objc3c_parser_draft_syntax_surface.py:192
  • scripts/build_objc3c_support_classification.py:374
  • scripts/build_objc3c_type_semantic_model_closure.py:369
  • scripts/check_objc3c_public_claim_drift.py:446

Performance And Reliability Requirements

• Keep helper code small, dependency-light, and fast enough for normal development feedback.
• Add focused tests for edge cases before broad migration.
• Preserve existing output schemas and public behavior unless an intentional bug fix is validated.
• Keep production helpers separated from test-only helpers.
• Do not use tmp/ as durable source-of-truth; generated temporary files are allowed only as transient command inputs.

Fast Tests

• Add tests for Markdown table escaping, path rendering, deterministic section output, and file writes.
• Run changed build/publish/materialize scripts in focused batches.
• Run python -m py_compile for changed modules/scripts.

End-To-End Completion Criteria

• Common Markdown/report primitives are shared without opaque framework calls.
• Durable report output remains deterministic.
• Reports with Markdown tables escape pipes correctly.