doslang-mirror/fec/tests/own

M6 fixtures

These fixtures pin the M6 ownership/borrow rules before implementation.

• ok*.fe must compile with --target=bits32 --emit-c.
• bad*.fe must fail compilation; the first line follows the // ERROR:<line>:<substring> convention from SPEC §12.
• They are registered in src/ferrolang_vm/registry.py, which is what decides whether a milestone runs.
• When M6 starts, wire this directory into the DOS/QEMU gate without changing the expected result of any fixture.
• M6 also owns the general-global borrow restriction from R10 because AGENTS.md explicitly groups that change with the own.c state-machine work.

Coverage: R4 storage restrictions, R5 scope, R6 shared/exclusive liveness, root-local field/index conflicts, call-only &mut -> & reborrows, branch/loop MaybeMoved and initialization-state merging, R7 invalidation, R8 derived-return provenance joins, defer lifetime extension, and global borrow restrictions.