debian/deps: native dependency grammar and build-dep checking
Replace dpkg-checkbuilddeps with a native implementation: - full dependency grammar: comma clauses, | alternatives, << <= = >= >> relations, :arch qualifiers (any/native/specific), [arch lists] and <profile restriction> formulas per alternative; - restriction reduction against active build profiles and the host arch at parse time (reduce_restrictions semantics); - evaluation against a parsed dpkg status database with Multi-Arch semantics (foreign/allowed) and versioned Provides rules (unversioned provides never satisfy versioned deps; versioned ones must satisfy the relation); - clause simplification with implication-based deduplication, rendering dpkg-compatible 'unmet build dependencies/conflicts' diagnostics. check_build_depends() consumes debian/control + CheckOpts (-A/-B/-I equivalents). run_source_build performs the check when forced (-D parity); source-only builds skip it entirely like dpkg-buildpackage, and unsatisfied deps propagate as UnmetBuildDependencies -> exit 3. Unit tests port the Dpkg_Deps.t reduction matrices; differential gate runs 24 scenarios (alternatives, versions, arch/profile restrictions, Multi-Arch, Provides, conflicts, -A/-B flags) against real dpkg-checkbuilddeps comparing exit status and diagnostics.
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