v1.6.55 Expand Core API backend test coverage baseline

[roncodes]

Summary

This PR completes the Core API backend full-coverage campaign on dev-v1.6.55.

Latest verified coverage baseline:

• Line coverage: 100.00% (19,872/19,872 statements)
• Method coverage: 100.00% (2,569/2,569 methods)
• Fully covered class coverage: 100.00% (393/393 classes)
• Touched class coverage: 100.00% (393/393 classes executed at least once)

The generated Clover report includes classes=393 but omits the coveredclasses metric, so the coverage summary derives fully covered class coverage from per-class statement metrics and separately reports touched classes.

Coverage Work

• Expanded controller and API contract coverage across auth, user, company, IAM metrics/search, settings, reports, templates, files, notifications, comments, channels, onboard, lookup, schedules, middleware, and webhook paths.
• Expanded reporting coverage for query validation, conversion, exporting, error handling, schema registration, computed columns, and execution failure contracts.
• Expanded service and support coverage for scheduling, template rendering, file resolution, SMS routing/providers, two-factor auth, telemetry, socket cluster, SQL dumping, API model cache, notification registry, data purging, and utility helpers.
• Expanded model and trait coverage for user/company membership behavior, scheduling models, chat models, settings, templates, reports, API model/controller behavior, custom fields, policies, lifecycle traits, internal ids, and API credential tracking.
• Added focused console command coverage for database creation, permissions, purge, backup trimming, recovery, migrate sandbox, and sync sandbox behavior.
• Added narrow coverage ignores only for defensive or unreachable framework/runtime fallback paths after validating the runtime contract.

Class Coverage Fix

• Fixed the class coverage summary issue where Clover omitted coveredclasses, which previously caused class coverage to appear as 0.00%.
• The summary now reports:
  • fully covered class coverage, derived from per-class statement metrics
  • touched class coverage, showing whether each class executed at least once

Validation

• PATH=/Users/ron/.asdf/shims:$PATH /usr/local/bin/composer lint
• git diff --check
• git diff --cached --check
• XDEBUG_MODE=coverage /Users/ron/.asdf/shims/php /usr/local/bin/composer coverage:baseline
• /Users/ron/.asdf/shims/php scripts/coverage-summary.php coverage/clover.xml

Full coverage run result:

• 1,326 tests passed
• 9,638 assertions
• 25 deprecated notices
• 6 warnings

Raw Clover uncovered-statement scan result:

• No uncovered statements.