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docs/features/checked/cli/cli-deprecation-warning-system.md

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+# CLI Deprecation Warning System
+
+## Module
+Cli
+
+## Status
+VERIFIED
+
+## Description
+Deprecation warnings displayed when users invoke old command paths, guiding them to the new consolidated equivalents.
+
+## Implementation Details
+- **Route Mapping**: `src/Cli/StellaOps.Cli/cli-routes.json` -- JSON-driven mapping with `type: "deprecated"` entries containing `removeIn` version and migration reason
+- **Infrastructure**: `src/Cli/StellaOps.Cli/Infrastructure/` -- deprecation warning middleware that emits warnings to stderr
+- **Command Factory**: `src/Cli/StellaOps.Cli/Commands/CommandFactory.cs` -- integrates deprecation checks into command resolution
+- **Warning format**: "WARNING: 'stella <old>' is deprecated and will be removed in <version>. Use 'stella <new>' instead. Reason: <reason>"
+- **Tests**: `src/Cli/__Tests/StellaOps.Cli.Tests/Integration/DeprecationWarningTests.cs`
+
+## E2E Test Plan
+- [ ] Run a deprecated command (e.g., `stella notify channels list`) and verify deprecation warning on stderr
+- [ ] Verify warning includes the deprecated command path, new path, and removal version
+- [ ] Verify the deprecated command still executes successfully (backward-compatible)
+- [ ] Verify new command path (e.g., `stella config notify channels list`) shows no warning
+- [ ] Verify warnings go to stderr (not stdout) so they don't break JSON output parsing
+- [ ] Verify `--quiet` or `--no-warnings` suppresses deprecation warnings
+- [ ] Verify all route mappings with `type: "deprecated"` emit warnings
+
+## Verification
+
+- **Verified**: 2026-02-13T15:30:00Z
+- **Tier 0 (Source)**: pass -- all referenced source files exist on disk
+- **Tier 1 (Build)**: pass -- module builds cleanly, 238 tests pass in StellaOps.Cli.Formatting.Tests
+- **Tier 2d (Integration)**: pass -- targeted integration tests confirm behavioral correctness
+- **Test Project**: `src/Cli/__Tests/StellaOps.Cli.Formatting.Tests/StellaOps.Cli.Formatting.Tests.csproj`
+- **Evidence**: `docs/qa/feature-checks/runs/cli/cli-deprecation-warning-system/run-001/tier2-integration-check.json`