measurements: add context measurement retrieval and listing queries

[Kzoeps]

Scope

Adds public org.hypercerts.context.getMeasurement and org.hypercerts.context.listMeasurements endpoints with author/subject filters, timestamp fallback ordering, cursor pagination, publisher hydration, and HTTP/unit coverage.

Validation

• Offline pnpm test:unit: 104/104 tests passed; pnpm check and pnpm build passed locally.
• Local pnpm test:http was not run. Unit tests use local fixtures/fake adapters and do not install handlers, seed PostgreSQL, or contact HappyView. CI HTTP coverage exercises real XRPC over HTTP against the installed HappyView + PostgreSQL test environment; its result is pending from PR creation.

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Project	Deployment	Actions	Updated
api-endpoints	Ready	Preview	Oct 6, 2026 3:29pm UTC

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📥 Commits

Reviewing files that changed from the base of the PR and between e7a5025 and 3f1098b.

📒 Files selected for processing (19)

• CONTRIBUTING.md
• README.md
• api/README.md
• api/lexicons/org.hypercerts.context.getMeasurement.json
• api/lexicons/org.hypercerts.context.listMeasurements.json
• api/lua/endpoints/getMeasurement.lua
• api/lua/endpoints/listMeasurements.lua
• api/lua/shared/measurementQuery.lua
• api/lua/src/getMeasurement.lua
• api/lua/src/listMeasurements.lua
• api/manifest.json
• api/modules/context-measurements/manifest.json
• api/modules/shared/manifest.json
• api/tests/http/context-measurements.http.test.js
• api/tests/http/fixtures/context-measurements.fixture.js
• api/tests/unit/context-measurements/measurements.lua
• api/tests/unit/context-measurements/measurements.test.js
• api/tests/unit/fixtures/http-seed-rows.test.js
• api/tests/unit/tooling/lexicons.test.js

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Latest commit: 3f1098b

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