Phase 0 (miroir-qon): Verify foundation completion

- Verified all build, test, clippy, and fmt checks pass
- Confirmed Config struct round-trips YAML
- Documented musl build limitation (requires cross-compiler)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

notes/miroir-qon-phase-0-verification.md

@@ -0,0 +1,40 @@
+# Phase 0 Foundation Verification
+
+## Date
+2026-05-09
+
+## Status
+✅ COMPLETE
+
+## Definition of Done Verification
+
+### Build Status
+- ✅ `cargo build --all` succeeds
+- ✅ `cargo test --all` succeeds (85 tests passed: 60 miroir-core, 17 cutover_race, 8 miroir_ctl lib)
+- ✅ `cargo clippy --all-targets --all-features -- -D warnings` passes
+- ✅ `cargo fmt --all -- --check` passes
+
+### Musl Target Build
+- ⚠️ `cargo build --release --target x86_64-unknown-linux-musl -p miroir-proxy` requires system cross-compiler
+- Missing: `x86_64-linux-musl-gcc` (not installed in current environment)
+- Note: This is a system dependency issue, not a code issue. The CI workflow does not include musl builds.
+
+### Config Struct
+- ✅ `Config` round-trips YAML → struct → YAML
+- Verified via `round_trip_yaml` test in `crates/miroir-core/src/config.rs`
+- Has `from_yaml()` method and full serde support
+
+### Workspace Structure
+- ✅ Cargo workspace with 3 crates: miroir-core, miroir-proxy, miroir-ctl
+- ✅ rust-toolchain.toml pinned to 1.88
+- ✅ All required dependencies wired
+- ✅ Style files: rustfmt.toml, clippy.toml, .editorconfig
+- ✅ CHANGELOG.md, LICENSE, .gitignore present
+
+### Child Beads
+- ✅ No child beads for this phase (Phase 0 is a single bead)
+
+## Summary
+Phase 0 foundation is complete. All code builds, tests pass, and the project structure is in place.
+The only exception is the musl target build, which requires a cross-compiler not present in the
+current development environment.