feat(tests): POSIX conformance coverage gate (Phase 4)#21
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tests/posix/coverage.sh: measures cfbox POSIX.1-2017 XCU conformance on two dimensions — standalone applet coverage (static vs cfbox --list) and shell builtin coverage (dynamic behavior probe via cfbox sh -c, not declaration). Baseline gate enforces 'only up, never down' (COVERAGE.md spirit): a drop below tests/posix/baseline fails CI. Current floor: utility 61/77 (79%), builtin 10/20 (50%), total 73%. Already surfaced real gaps: dd (P0 utility) missing, and 10 sh builtins absent (command/type/exec/getopts/hash/umask/ulimit/wait/times/unalias) — queued as follow-up batches, not fixed here. CI: added to native stage after structure gates.
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tests/posix/coverage.sh: measures cfbox POSIX.1-2017 XCU conformance on two dimensions — standalone applet coverage (static vs cfbox --list) and shell builtin coverage (dynamic behavior probe via cfbox sh -c, not declaration). Baseline gate enforces 'only up, never down' (COVERAGE.md spirit): a drop below tests/posix/baseline fails CI. Current floor: utility 61/77 (79%), builtin 10/20 (50%), total 73%.
Already surfaced real gaps: dd (P0 utility) missing, and 10 sh builtins absent (command/type/exec/getopts/hash/umask/ulimit/wait/times/unalias) — queued as follow-up batches, not fixed here.
CI: added to native stage after structure gates.