test: add comprehensive unit tests for Template::Service

[toddr-bot]

What

78 unit tests for Template::Service, the orchestration layer between Template.pm and Template::Context.

Why

Existing t/service.t only has template-based integration tests via test_expect(). No unit-level coverage of constructor config parsing, error recovery dispatch, or pipeline edge cases.

How

Tests exercise every code path in Service.pm:

• Constructor (18 tests): defaults, string→array coercion, custom DELIMITER splitting, ERROR/ERRORS alias, AUTO_RESET default, DEBUG flag masking, CONTEXT pass-through, context creation failure
• process() pipeline (36 tests): basic interpolation, PRE/POST_PROCESS ordering, single and nested WRAPPERs, PROCESS override, template variable injection, code ref templates, param isolation between calls, AUTO_RESET on/off, missing template errors, bad PRE/POST/WRAPPER failures, STOP exception output, stash delocalise on error
• _recover() dispatch (18 tests): non-exception passthrough, stop text extraction, no-handler undef, hash handler type matching, default fallback, no-match-no-default, scalar catch-all, missing handler template, hierarchical exception matching (user.auth → user)
• DEBUG (2 tests): service debug logging doesn't crash, non-service debug flags ignored

Testing

perl -Ilib t/service_methods.t  # 78/78 pass
make test                        # full suite green

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Quality Report

Changes: 1 file changed, 647 insertions(+)

Code scan: 1 issue(s) found

• t/service_methods.t:0 — 647 lines added

Tests: passed (OK)

Branch hygiene: clean

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