[LunaStev]

External Meson consumers need independent build directories, verified reusable result files, and complete last-good outputs when a rebuild fails. Add the approved format-5 build model and the v0.0.3-beta implementation across manifest, resolver, compiler, state, CLI, tooling and documentation.

• Separate source, build and dependency storage with coordinated leases; support prepared read-only locked/offline builds.
• Publish immutable artifact generations through a recoverable commit point, with owned artifact manifests and depfiles. Preserve prior outputs on compile failure, cancellation and interrupted publication.
• Add explicit compiler/std content pins, typed freestanding/relocation settings, deterministic target-aware static archives, portable provenance and metadata schema 3/build-plan schema 2.
• Supply a Meson C/C++/Rust consumer, scoped package-graph integration, and static-library execution in the existing nine-host acceptance lanes.
• Fix the selected installer, compiler-plan, diagnostics, conditional-remove and output-contract regressions; update repository ownership/forms/roadmap and patch zip to 9.0.5 without audit exemptions or dependency bots.

Validation: Meson check (format, Python tooling, workspace Rust tests, all-target Clippy and build) and Meson quality (source/repository policy, external links, clean dependency audit, 2,000 parser mutations) passed. The artifact integrity suite passes 19 tests including interrupted report recovery and cancellation preserving completed outputs. Windows GNU and Linux ARM64/RISC-V/LoongArch workspace cross-checks passed; these are compile checks, not native execution. Linux release-profile packaging, version/help smoke and SHA256SUMS passed as a development package, not a published release. Actual public Wave 0.2.1 baseline and O0/O2 static C/C++/Rust interop passed locally. Prepared development Wave also passed scoped transitive versions, the full Meson consumer, and separate-directory O0/O2 archive/provenance comparisons across all nine target formats. Remote platform CI must validate this PR's exact head.

Companion compiler work: wavefnd/Wave#1071. Existing public Wave 0.2.1 gates remain required. As approved, the new scoped graph, complete source-input and path-remapping acceptance becomes mandatory only after a compatible public Wave artifact is released and pinned; no source-build gate or implicit installation is introduced. #58, #182 and #184 remain linked for that companion/public-release acceptance rather than being closed prematurely.

The previously approved executable-main test-target contract satisfies #60; no compiler-specific unit-test harness is claimed. Manifest formats 1–4 retain their meaning without automatic conversion; existing lock and exclusive JSONL contracts remain.

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