Guard scheduler checks before AS datastore init

[chubes4]

Summary

• Guard Data Machine scheduler reads against Action Scheduler's readiness signal before calling AS procedural query APIs.
• Skip Action Scheduler's background migration scheduling during wp-phpunit install bootstrap while leaving datastore setup intact.
• Add a pure-PHP smoke covering the uninitialized datastore path.

Testing

• php tests/recurring-scheduler-as-readiness-smoke.php
• php tests/recurring-scheduler-idempotency-smoke.php
• composer run lint
• homeboy test data-machine
• DM_PATH=/Users/chubes/Developer/data-machine@fix-as-datastore-readiness-guard DMC_PATH=/Users/chubes/Developer/dmc-proof-no-requires/data-machine-code bash tests/playground-ci/scripts/run-stage-1.sh
• DM_PATH=/Users/chubes/Developer/data-machine@fix-as-datastore-readiness-guard DMC_PATH=/Users/chubes/Developer/dmc-proof-no-requires/data-machine-code bash tests/playground-ci/scripts/run-stage-2.sh
• DM_PATH=/Users/chubes/Developer/data-machine@fix-as-datastore-readiness-guard DMC_PATH=/Users/chubes/Developer/dmc-proof-no-requires/data-machine-code bash tests/playground-ci/scripts/run-stage-3.sh

Notes

• Stage 1/2 no longer print the Action Scheduler datastore initialization notice.
• Stage 3 passed on retry after one transient fetch failed from Playground before WordPress bootstrap completed.
• External proof used a temporary DMC copy with its Requires Plugins: data-machine header removed to avoid the validation runner also mounting the primary Data Machine checkout while this PR branch lives in a worktree named data-machine@fix-as-datastore-readiness-guard.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (gpt-5.5)
• Used for: Drafted the code/test changes and ran verification; Chris reviews the final diff.

[homeboy-ci]

Homeboy Results — data-machine

Lint

✅ lint — passed

ℹ️ Full options: homeboy docs commands/lint
Deep dive: homeboy lint data-machine --changed-since edb444a

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 edb444a

Audit

✅ audit — passed

• dead_guard — 9 finding(s)
• Flows — 4 finding(s)
• test_coverage — 3 finding(s)
• intra-method-duplication — 2 finding(s)
• Total: 18 finding(s)

Deep dive: homeboy audit data-machine --changed-since edb444a

Tooling versions

• Homeboy CLI: homeboy 0.157.1+cc5eff27
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: ebde078
• Action: Extra-Chill/homeboy-action@v2