find and fix the real ACL-TTL measurement bug (zuse session never authenticated, ACL enforcement never active) Two mistakes corrected in sequence, both documented in full in FABRIC-2.md Section R: 1. HEARTBEAT-TICKS@ was swapped to read heartbeat_ticks() -- a newer, kernel-only ISR hardware-timer counter (src/starkernel/heartbeat.c, the M5 TIME-TRUST engine) -- based on a misreading of which counter "the one clock" law refers to. Reverted to vm->heartbeat.tick_count, Loop #7 "Adaptive Heartrate", the actual year-plus-old counter the whole physics runtime is built on. Removed the now-irrelevant HEARTBEAT-PERIOD-NS@ accessor added to diagnose the wrong counter's adaptive re-arm period. Three-arch QEMU re-acceptance: POST 1012/0/0 on amd64/aarch64/riscv64, HEARTBEAT-TICKS@ confirmed returning 77 (matching the original pre-heartbeat_ticks() acceptance) on all three. 2. The real bug, found after the revert: every "ACL enabled" measurement in this investigation (Section P's 18-cell campaign, Section Q's pilot) loaded ACL.4th and ran EXEC-DOE from the bare `ok>` prompt without ever authenticating a zuse session. repl.c:303 keeps emergency_console=1 until zuse_session=1; vm_core.c:755 skips the entire ACL check block (TTL decrement and acl_recheck()) whenever emergency_console is set. ACL was configured but never armed. capsules/zuse.4th's pre-existing self-pin bug means the documented automatic zuse activation doesn't work either (still flagged, not fixed) -- worked around by invoking the directly-registered ZUSE-AUTHENTICATE word explicitly. Validated pilot (amd64, seed 12345, 30 reps, same build, disabled vs. genuinely zuse-authenticated-enabled): +117 ticks, +0.0448% overhead. Disabled-arm determinism double-confirmed (261064 ticks, exact repeat on a fresh boot) -- the 117-tick difference is real signal, not noise. Reconciles with the original ACL-RWT campaign's own heartbeat-tick result (+0.0054%-0.0088%, same order of magnitude). Section P's wall-clock numbers and Section Q's "instrument blind" conclusion are both marked invalidated/corrected in place, not deleted. n=1 per arm, one architecture -- not yet a full campaign. Scoped as next step, not undertaken in this pass. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
src/
Hosted StarForth VM implementation (compiled by the root Makefile).
Bare-metal kernel sources live in src/starkernel/; FORTH word
implementations in src/word_source/; the test harness in
src/test_runner/; platform shims in src/platform/.
Entry point / interpreter core
main.c— CLI entry point, VM init, DoE mode dispatch.vm.c— interpreter loop, stacks, dictionary state (the central runtime file).vm_api.c— external VM API implementation.vm_bootstrap.c— VM bootstrap initialization.vm_debug.c— debugging utilities.vm_time.c— time-related VM operations.vm_internal.h— internal-only declarations shared across thevm_*.cfiles, not part of the publicinclude/vm_api.hsurface.repl.c— REPL read-eval-print loop.cli.c— CLI argument parsing.io.c— I/O operations.log.c— logging infrastructure.
Memory / dictionary / blocks
memory_management.c— dictionary allocator.dictionary_management.c— dictionary allocation and search.dictionary_heat_optimization.c— Loop #1 execution-heat tracking.word_registry.c— word registration system.block_subsystem.c— logical→physical block mapper.blkio_file.c,blkio_ram.c,blkio_factory.c— block I/O backends (file-backed, RAM-backed) and the factory that selects between them.stack_management.c— stack operations.
Physics-driven adaptive runtime (7 feedback loops)
physics_runtime.c— main physics coordinator.physics_hotwords_cache.c— Loop #1 hot-words caching.physics_metadata.c— per-word metadata tracking.physics_pipelining_metrics.c— Loop #4 word-transition prediction.physics_execution_hooks.c— execution instrumentation.rolling_window_of_truth.c— Loop #2 circular execution-history buffer.inference_engine.c— Loops #5/#6, statistical inference (window-width, decay-slope).ssm_jacquard.c— L8 Jacquard steady-state mode selector; consumescompudynamics.cfor tuning-word/config lookups.compudynamics.c— generic compudynamics module (cd_tuning_word(),cd_tuning_vm()); the score/UCB/reward/weight constants for the L8 adaptive table live here, not inssm_jacquard.c.heartbeat_export.c— heartbeat metrics export (CSV export function itself not yet implemented — seedocs/working/architecture/heartbeat_csv_export.md).
Math / measurement
math_portable.c— portable math functions.profiler.c— performance profiling.doe_metrics.c— Design of Experiments metrics (2^7 factorial).
Any .bak file alongside a .c file here (doe_metrics.c.bak,
inference_engine.c.bak, vm.c.bak) is a pre-edit backup left by a past
maintenance script (see scripts/remove_loop_conditionals.sh), not a
build input.