feat(os): OS operator kernels in CUBE + thin native effector (Steps 1 & 2)
- cubecode/src/cb.rs: Behavior descriptor bitflag (PURE/IO_HEAVY/HOT_PATH)
encoded into HeaderFlags bits 13..15; C_OS_KERNEL=210 / C_OS_EFFECT=211
coordinate bands; round-trip unit test.
- fix: HEADER_FLAG_BEHAVIOR mask was 0x7000 (bits 12-14) which grabbed the
ENCRYPTED bit (12) and dropped HOT_PATH (bit 15). Corrected to 0xE000.
- store_code_cell/put_code_cell/header_for_code gain optional descriptor arg;
all 12 prior call sites pass None (total change).
- CLI: prog K=<flag> tokens, kernel verb (links+descriptors), tick verb lays
down the OS kernel call-graph (cfg->decide->summarize->tick), native-apply
verb = thin effector (runs kernel in VM, reads computed result, emits effect).
- integration test os_kernels_live_in_cube_with_call_graph_and_descriptors.
Proven green via ./check quick (fmt+clippy -D warnings+tests).
CUBELinux-2
1539ecd1bb