Initial scaffold: solution, projects, scoring, adapters, infra, web/workers, scripts, docs and CI/tests

[Code-311]

Motivation

• Provide a complete .NET monorepo scaffold for SentinelCareer including domain model, application services, infrastructure, web UI and background workers to enable local Windows-focused productionization and validation.
• Capture deterministic-first scoring, resilient ingestion adapters/parsing, persistence and review/workflow primitives so the system can ingest, score and surface opportunities for operator triage.
• Add automation, docs and scripts for one-command local setup/start, validation evidence capture and DB backup/restore to make Windows-local onboarding reproducible.
• Introduce CI/security workflows and a central package/version manifest to enforce build/test/format checks and dependency scanning.

Description

• Added solution and projects: Contracts, Domain, Application, Infrastructure, Web, Workers, Python workers, and multiple test projects, plus Directory.Packages.props, global.json, and .editorconfig to standardize builds and styles.
• Implemented domain entities/enums, deterministic scoring (ScoringEngine), normalization and dedupe services, repositories, EF Core SentinelCareerDbContext, baseline SQL migration, seed validation pack and notification/LLM contract stubs.
• Built resilient ingestion adapters and HTML parser, web Razor pages for triage/dashboard, background workers for ingestion & scoring with notification semantics, and DI/service registration in ServiceCollectionExtensions.
• Added operational scripts for setup/start/backup/restore/validation (scripts/*.ps1), host validation/reporting/docs, README and GitHub Actions workflows for ci, security and package-windows packaging.

Testing

• Added many automated tests: unit tests for DedupeService, NormalizationService, ScoringEngine, and ScoreBandClassifier, adapter/parser tests, workers notification semantics tests, web smoke tests, and guarded Postgres integration tests under tests/ as well as Python adapter tests.
• CI workflow ci (GitHub Actions) is configured to run dotnet restore, dotnet build, dotnet test and dotnet format --verify-no-changes on pushes and PRs.
• Integration tests that hit PostgreSQL require the SENTINELCAREER_TEST_PG environment variable and are intentionally no-op when it is not set.
• No automated test run results are included in this rollout transcript; the PR adds the CI configuration to run the tests but execution status is not available here.

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Codex Task