fix(templates): bump Tested up to 7.1, robust version compare, REST item schema (A, B, C)

[akshat009]

Addresses items A, B, C from the open-issues report.

A — Tested up to: 6.9 is two majors behind

• Extracted a TESTED_UP_TO constant ('7.1') next to MIN_PHP, plus a versionGte() helper that compares dot-separated integer segments instead of parseFloat() on a version string (parseFloat('6.10') === 6.1, which would silently produce a Tested up to below Requires at least once WP ships an x.10).

B — {@see Services} dangles in accessor-less builds

• Plugin.php's class docblock now only mentions the Services locator under {{#if has_services}}, reusing the same flag fix(templates): nest the REST endpoint so 'schema' survives register_rest_route()'s upgrade step (C) #16 already wired through Services.php / Plugin_TestCase.php. Reflowed the surrounding sentences so the accessor-less docblock still reads cleanly instead of leaving an orphaned clause mid-line.

C — REST controller shipped no schema

• Rest_Controller::get_item_schema() now describes get_items()'s actual response shape (message: string, param: string|null), wired into register_routes() via 'schema' => $this->get_public_item_schema( ... ) (first-class callable, matching the file's existing style).
• Extended the WP_REST_Controller unit-test stub (tests/bootstrap.php) with $schema, get_public_item_schema(), and add_additional_fields_schema() — real WP core provides these; the stub didn't, which would have fataled every generated test hitting register_routes() now that it calls get_public_item_schema().
• Added Rest_Controller_Test::test_get_item_schema_describes_the_response_shape.

Verification

Beyond the CLI's own suite (npm test: 69/69):

• Generated a real --modules rest_api,caching scaffold and ran it for real:
  • composer install + composer test → 12/12 PHPUnit tests, 17 assertions (the __() stub gap in the new test was only caught this way — first attempt fatal'd with "Call to undefined function __()", fixed by stubbing it via Brain Monkey like the rest of the suite does).
  • composer lint → 15/15 files scanned, 0 errors / 0 warnings, exit 0.
• Confirmed the has_services-gated Plugin.php docblock renders cleanly in both an accessor-less scaffold (--modules "") and an accessor-bearing one.
• Confirmed readme.txt renders Tested up to: 7.1.
• php -l clean on every generated file in both scaffolds.

D (test suite depth) is out of scope here — it's flagged as the larger, separate item in the report.

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