T81 Foundation

Changelog

Source of Truth: This document defines the history of changes released to the public. For future plans, see ../process/roadmaps-plans/ROADMAP.md.

All notable changes to this project are documented in this file.

The format is based on Keep a Changelog.

[Unreleased]

[1.3.2] - 2026-03-08

Added

• code profile compile-and-profile workflow for .t81 and .tisc inputs.
• tisc stats, trace filter, determinism multi-run, ir validate, axion audit, env clean, weights export, and the tier command family.
• --dry-run support for canonfs rollback and canonfs gc.

Fixed

• project build, project run, and project test now dispatch correctly instead of falling through to Unknown command: code.
• memory-stats is accepted consistently by argument parsing and now emits the expected legacy alias warning.
• Help routing for env check, env diag, env feedback, and project build/run/test now resolves to the correct subcommand help.
• CLI help output now goes to stdout, restoring normal pipe and redirection behavior.
• Global parse errors no longer call std::exit(1) directly.
• --json failures now emit a JSON error envelope with schema t81.error.v1.

Changed

• Help dispatch is deduplicated across help and --help entry paths.
• lang help now explicitly documents that it is a compatibility alias for code plus ir.
• CLI reference manual and contract tests were updated to match the shipped command surface and help/output behavior.

Added

• Support for assignment to array indices (e.g., arr[i] = x) and object fields (e.g., obj.field = x).
• T81Int::significant_trits() method to determine the number of used trits.
• std::span optimization in T81BigInt Karatsuba multiplication, avoiding unnecessary vector copies.
• Fast path in T81BigInt multiplication and addition to avoid Axion trap logs for expected overflows.
• Implemented gumbel_add in T81Prob using T81Entropy for deterministic Gumbel noise injection.
• Regression tests for T81BigInt division allocation pathology (t81_bigint_allocation_pathology_test, t81_bigint_allocation_guardrail_test).
• Implemented extended_gcd and modular_inverse for T81BigInt, enabling basic cryptographic primitives.

Fixed

• Allocation pathology in T81BigInt::div_mod (and to_std_chunks) by reserving vector capacity, preventing quadratic growth during division of large numbers.

Changed

• Documentation baseline aligned to C++23-default reality across root/docs guides and status reports.
• Root .tisc artifacts moved into examples/tisc/ to keep repository root clean.
• Repository audit snapshots refreshed (docs/records/inventories/repo_tree*.txt, docs/records/inventories/repo_inventory.tsv).
• Added RFC draft RFC-0024 to track spec/governance wording alignment for C++23 default + C++20 compatibility lane.

Build/CI

• Single-threaded local ritual support is documented and validated for host-stability workflows.

Notes

• Historical completed work is retained in commit history and supporting docs (../explanation/ANALYSIS.md, system-status.md).

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