AzLocal.UpdateManagement v0.8.71 - JUnit export strict-mode fix + sideload schedule-path default + de-numbered pipeline doc refs

[NeilBird]

Summary

Patch release v0.8.71. Fixes a production strict-mode crash in JUnit export, corrects the GitHub Actions sideload schedule-path default, and de-numbers stale Step.N_*.yml filename references left behind in pipeline doc strings after the v0.8.7 rename. No public API or export-count change (still 60).

Fixes

• Export-ResultsToJUnitXml strict-mode crash (production) - a live Apply Updates run failed with Failed to export results: The property 'CurrentState' cannot be found on this object. An UpdateStarted success row legitimately lacks CurrentState/Progress, but the failure and success/default branches read those properties unguarded, which throws under Set-StrictMode -Version Latest. All bare reads (CurrentState, Progress, UpdateName) are now guarded with PSObject.Properties[...]. Regression test added.
• Sideload schedule-path default - GitHub Actions sideload-updates.yml APPLY_UPDATES_SCHEDULE_PATH default corrected from ./.github/apply-updates-schedule.yml to ./config/apply-updates-schedule.yml, matching where Copy-AzLocalPipelineExample drops the starter.
• Stale pipeline doc-string filenames - de-numbered Step.N_*.yml references in apply-updates-schedule-audit.yml, assess-update-readiness.yml, authentication-test.yml (both platforms) and the apply-updates-schedule.example.yml starter.

Version bump 0.8.7 -> 0.8.71

• .psd1 ModuleVersion + ReleaseNotes, .psm1 $script:ModuleVersion, the Pester version assertion, and all 22 bundled YAML GENERATED_AGAINST_MODULE_VERSION pins.
• CHANGELOG, README (header + URL + TOC + promoted v0.8.71 / demoted v0.8.7 to Release History), and docs/release-history.md.

Testing

Full Pester suite green: 1101 total, 1100 passed, 0 failed, 1 skipped (env-only live-integration).