Remove legacy migration repair paths

[chubes4]

Summary

• Removes the flows migrate-legacy-handler-shape WP-CLI repair command and its one-shot migrator/test so stored workflow specs stay canonical-only for 1.0.
• Drops recurring task-scoped hook discovery/cleanup and keeps recurring schedule reconciliation on canonical schedule-scoped hooks only.
• Removes the frontend fallback for the old bare-array flow memory-files response shape and updates docs to match the remaining 1.0 surface.

Verification

• php -l inc/Cli/Commands/Flows/FlowsCommand.php && php -l inc/Engine/AI/System/SystemAgentServiceProvider.php && php -l inc/Engine/Tasks/RecurringScheduleRegistry.php && php tests/recurring-schedule-registry-contract-smoke.php && php tests/workflow-spec-contract-smoke.php && php tests/system-task-workflow-validation-smoke.php
• vendor/bin/phpcs inc/Cli/Commands/Flows/FlowsCommand.php inc/Engine/AI/System/SystemAgentServiceProvider.php inc/Engine/Tasks/RecurringScheduleRegistry.php tests/recurring-schedule-registry-contract-smoke.php
• homeboy lint --path . --extension wordpress --changed-only
• homeboy test --path . --extension wordpress --changed-since HEAD
• git diff --check

Notes

• Full homeboy lint --path . --extension wordpress was also run after the first edit. It reported two unrelated existing findings in inc/Engine/AI/ConversationManager.php and inc/Core/FilesRepository/MediaValidator.php, plus one local formatting issue that was fixed. The changed-only lint is green with no baseline drift.

Follow-up

• Finish the final pre-1.0 migration nuke by reviewing remaining deploy-time schema ensures under inc/migrations/ and repository-level migrate_* methods that still have concrete table/column responsibilities.
• Audit remaining compatibility wording and non-runtime docs for public extension hooks that should either become canonical 1.0 contracts or be removed.
• Coordinate any result/tool-contract compatibility removals with the active result/tool-contract lane to avoid conflicts.

Closes #2411.
Refs #2418.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Inventorying legacy/backcompat paths, drafting the code removals, updating tests/docs, and running verification. Chris remains responsible for review and merge.

[homeboy-ci]

Homeboy Results — data-machine

Lint

✅ lint — passed

ℹ️ Full options: homeboy docs commands/lint
Deep dive: homeboy lint data-machine --changed-since 424a39a

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-lint-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-lint-quality-Linux-node24 contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/data-machine/actions/runs/26714809188

Test

✅ test — passed

ℹ️ Auto-fix lint issues: homeboy refactor data-machine --from lint --write
ℹ️ Collect coverage: homeboy test data-machine --coverage
ℹ️ Pass args to test runner: homeboy test -- [args]
ℹ️ Full options: homeboy docs commands/test
Deep dive: homeboy test data-machine --changed-since 424a39a

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-test-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-test-quality-Linux-node24 contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/data-machine/actions/runs/26714809188

Audit

✅ audit — passed

• audit — 33 finding(s)
• Total: 33 finding(s)

Deep dive: homeboy audit data-machine --changed-since 424a39a

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-audit-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-audit-quality-Linux-node24 contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/data-machine/actions/runs/26714809188

Tooling versions

• Homeboy CLI: homeboy 0.213.4+8e7a1ed7
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: 06cc67ae
• Action: unknown@unknown