ADR-069: Remove the unusable PromptTemplate stack 

Context 

The extension shipped a PromptTemplate domain stack from an early design phase: the DomainModelPromptTemplate entity, its DomainRepositoryPromptTemplateRepository, the ServicePromptTemplateService (+ PromptTemplateServiceInterface), the ExceptionPromptTemplateNotFoundException, and the tx_nrllm_prompttemplate table in ext_tables.sql.

The stack was never usable at runtime and had no production consumers:

• No TCA. Configuration/TCA/ has no tx_nrllm_prompttemplate.php and Configuration/Extbase/Persistence/Classes.php has no PromptTemplate mapping. Without either, Extbase cannot map the table, so every PromptTemplateRepository method fails at runtime.
• Zero consumers. Nothing injected PromptTemplateServiceInterface or the repository. The only PromptTemplate references elsewhere were the unrelated Task::getPromptTemplate() / prompt_template string column and ADR-031's contrast with PromptSnippet.
• No coverage. No functional test loaded the PromptTemplates.csv fixture; the repository had 0% coverage from every suite. The service was unit-tested only against a mocked repository, so the runtime gap never surfaced. This was found while closing zero-coverage gaps (GitHub issue #399).

The stack was superseded twice: ADR-031 introduced the lightweight PromptSnippet library for reusable prompt fragments, and the Task entity (with its prompt_template string field) covers predefined, editor-managed prompts. Adding TCA plus functional tests to resurrect the stack would invest in a surface no code uses.

Decision 

Remove the dormant PromptTemplate stack in full:

• the DomainModelPromptTemplate entity and DomainRepositoryPromptTemplateRepository;
• the ServicePromptTemplateService and ServicePromptTemplateServiceInterface, including the public interface alias in Configuration/Services.yaml;
• the ExceptionPromptTemplateNotFoundException (used solely by the removed service);
• the tx_nrllm_prompttemplate CREATE TABLE block in ext_tables.sql;
• the unit tests and the PromptTemplates.csv functional fixture that covered only the removed classes.

Task's unrelated prompt_template string field, PromptSnippet, and ADR-031 are untouched.

Consequences 

• BREAKING (public API). ServicePromptTemplateService and ServicePromptTemplateServiceInterface are removed from the DI container. Any external caller resolving them would have failed at runtime already (no TCA), so no working integration can break; the removal is nonetheless a public-surface change and is called out for completeness. Pre-1.0, this is acceptable.
• Orphaned database table. tx_nrllm_prompttemplate is no longer declared. TYPO3 does not drop tables automatically; on existing installations the table becomes orphaned. Operators remove it via the database analyzer (Admin Tools > Maintenance > Analyze Database Structure). No upgrade wizard is provided — the table held no data any code ever wrote.
• Public-service count: 27 → 26. Removing the PromptTemplateServiceInterface alias drops the audited public: true count from 27 (ADR-065) to 26. This ADR is the new count authority, superseding ADR-065's count exactly as ADR-065 superseded ADR-028's. The breakdown is now 14 + 5 + 1 + 4 + 2 = 26: ADR-065's Category B (supporting-service interface aliases) drops from 6 to 5. The TestsUnitConfigurationPublicServicesPolicyTest EXPECTED_PUBLIC_TRUE_COUNT constant and this ADR are the audit trail. ADR-065 remains the record of the 45 → 27 reduction.
• One prompt surface, not two. ADR-031's "two prompt-related entities now coexist" no longer holds: PromptSnippet (fragments) and Task (predefined prompts) are the remaining surfaces.