story-kit: create 108_story_test_coverage_http_agents_rs_to_70

.story_kit/work/1_upcoming/108_story_test_coverage_http_agents_rs_to_70.md

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+---
+name: "Test Coverage: http/agents.rs to 70%"
+---
+
+# Story 108: Test Coverage: http/agents.rs to 70%
+
+## User Story
+
+As a developer, I want http/agents.rs to have at least 70% test coverage, so that regressions in REST agent status/control endpoints are caught early.
+
+## Acceptance Criteria
+
+- [ ] server/src/http/agents.rs reaches at least 70% line coverage (currently 38%, 155 lines missed)
+- [ ] cargo clippy passes with no warnings
+- [ ] cargo test passes with all tests green
+- [ ] No changes to production code, only test code added
+
+## Out of Scope
+
+- TBD