fix(templates): make Services.php + its reset() wiring accessor-conditional (#16, #17)

[akshat009]

Closes re-audit #3's #16 and #17.

What changed

• fix(templates): nest the REST endpoint so 'schema' survives register_rest_route()'s upgrade step (C) #16 — src/Services.php now ships only when at least one selected module registers a Services accessor. A zero-accessor build (e.g. --modules shortcode) no longer carries a dead class with nothing but set()/reset() over a permanently empty array.
• Wired via a new has_services flag in templateFlags (index.js), consumed by templates/tests/Unit/Plugin_TestCase.php through the existing {{#if flag}} template engine — its use Services; import and Services::reset() call in tearDown() are now gated the same way.
• test(templates): uniform init_hooks() contract test across all 22 module classes (D) #17 — the generated Services_Test accessor test (built in addService()) now also asserts the default construction path (assertInstanceOf on a bare Services::x() call, before any set()), in addition to the memoisation, set()-override, and reset()-clears-the-override paths already covered.

Test suite

Updated tests/generator.test.js to match:

• "foundational classes" test no longer expects src/Services.php in a zero-module scaffold; asserts it's absent instead (fix(templates): nest the REST endpoint so 'schema' survives register_rest_route()'s upgrade step (C) #16).
• test-isolation test (fix(templates): make Services.php + its reset() wiring accessor-conditional (#16, #17) #14, fix(templates): bump Tested up to 7.1, robust version compare, REST item schema (A, B, C) #15) now splits Plugin_TestCase assertions between an accessor-bearing scaffold and a zero-accessor one, and checks the rewritten Services_Test body (default-construction assertion, 'built once'/'set() overrides'/'reset() cleared the override' messages).

Verification

• npm test: 69/69 pass.
• Two ad hoc scaffolds (--modules "" and --modules caching) generated directly via the CLI and inspected — output matches the design; php -l clean on every generated file in both.

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