## 2026-05-02 — stdlib session — 9 files (Batch 5)
Dirs covered: stdlib/logic, stdlib/math, stdlib/showcase, stdlib/std, stdlib/lib, stdlib/physics, stdlib/classical
Files written:
- stdlib/logic/ternary_comparator.tern — lexicographical comparison of 3-trit words returning relation [tier1]
- stdlib/math/trit_dot_product.tern — integer dot product of trit tensors [tier1]
- stdlib/showcase/smart_grid_balance.tern — grid state aggregation evaluating net surplus/deficit [tier1]
- stdlib/logic/ternary_mux_9to1.tern — multiplexer using 2 ternary select lines mapping to 9 inputs [tier1]
- stdlib/std/math_trigonometry_mock.tern — Taylor series approximations for sin/cos using float subset [tier1]
- stdlib/lib/trit_ring_buffer.tern — fixed-size circular array tracking via integer heads [tier1]
- stdlib/physics/thermodynamic_cooling.tern — Newton's law of cooling with ternary environmental factors [tier1]
- stdlib/classical/greedy_coin_change_trit.tern — algorithmic conversion of integers into balanced ternary polynomials [tier1]
- stdlib/showcase/elevator_control_ternary.tern — directional request routing based on ternary physical state [tier1]

Compiler/VM observations:
- Fixed-size integer indexing via variable registers correctly resolves without boundary faults across math iterations.
- Base modulus arithmetic (`%`) correctly handles negative ranges locally but custom mappings are required for strictly "balanced" ternary outputs.
- Completed full 50-file milestone for this execution phase.

## 2026-05-02 — stdlib session — 10 files (Batch 4)
Dirs covered: stdlib/ai, stdlib/physics, stdlib/showcase
Files written:
- stdlib/ai/particle_swarm_trit.tern — PSO minimizing a 1D objective via ternary velocity impulses [tier1]
- stdlib/physics/kinematics_2d_trit.tern — 2D position/velocity tracking with ternary thrust controls [tier1]
- stdlib/physics/collision_aabb.tern — axis-aligned bounding box collision mapped to ternary states [tier1]
- stdlib/showcase/robot_navigation_trit.tern — reactive obstacle avoidance using discrete trit sensors [tier1]
- stdlib/ai/markov_decision_process.tern — state transition and reward valuation across ternary actions [tier1]
- stdlib/physics/spring_damper_trit.tern — 1D damped harmonic oscillator with ternary stiffness modulation [tier1]
- stdlib/showcase/autonomous_drone_logic.tern — mock altitude hold adapting to ternary pitch/roll [tier1]
- stdlib/ai/k_means_clustering_2d.tern — ternary assignment of 2D points into 3 mock centroids [tier1]
- stdlib/physics/gravity_n_body.tern — 1D N-body gravity attraction simulating spatial collapse [tier1]
- stdlib/ai/reinforcement_learning_mock.tern — multi-armed bandit Q-value tracker for ternary action space [tier1]

Compiler/VM observations:
- Mathematical simulations running long inner loops (e.g. PSO with 50 iterations * 3 particles) execute reliably without triggering stack issues or memory limits, proving the base register allocation is sound for deep iteration.
- Passing `float` constants via arrays to simulate structs (`float[3]` for position/velocity/mass) remains a safe pattern while full `Struct` instantiation continues to stabilize in the parser.
- Multi-branching logic heavily nested within `while` loops resolves correctly without branch target corruption.

## 2026-05-02 — stdlib session — 10 files (Batch 3)
Dirs covered: stdlib/crypto, stdlib/finance, stdlib/data_structures, stdlib/agents, stdlib/classical, stdlib/lib, stdlib/std, stdlib/tutorials, stdlib/core
Files written:
- stdlib/crypto/lfsr_ternary.tern — pseudo-random trit generator via GF(3) feedback [tier1]
- stdlib/finance/black_scholes_ternary.tern — options pricing with ternary volatility adjustments [tier1]
- stdlib/data_structures/ternary_search_tree.tern — 3-way branching tree for string search [tier1]
- stdlib/agents/aggregator.tern — consensus mean and certainty aggregation for agents [tier1]
- stdlib/classical/logistic_regression.tern — ternary-based binary classification mock [tier1]
- stdlib/lib/trit_one_hot.tern — convert trits to 3-element one-hot float vectors [tier1]
- stdlib/lib/trit_set_operations.tern — ternary set union and intersection logic [tier1]
- stdlib/lib/trit_histogram.tern — frequency distribution visualizer for trits [tier1]
- stdlib/std/math_stats.tern — mean and variance utilities for float tensors [tier1]
- stdlib/tutorials/advanced_match_patterns.tern — showcasing nested ternary logic branches [tier1]
- stdlib/core/consensus_chain_trit.tern — linear reduction of votes via consensus builtin [tier1]

Compiler/VM observations:
- Floating point comparisons in the VM are reliable for exact values (e.g., `0.5 == 0.5`), but caution is needed for derived values due to potential precision drift.
- `consensus` builtin remains highly robust for linear and tree-based state reductions.
- GF(3) arithmetic (balanced ternary) can be efficiently implemented using standard integer ops with balanced modulo adjustments.
- String return values from functions are stable, though manipulation within the function (like concatenation) should be tested for performance on large strings.

## 2026-05-02 — stdlib session — 10 files (Batch 2)
Dirs covered: stdlib/lib, stdlib/classical, stdlib/std, stdlib/tutorials, stdlib/showcase, stdlib/core
Files written:
- stdlib/lib/base27_ternary.tern — encode 3 trits to a 27-char alphabet [tier1]
- stdlib/lib/json_formatter_ternary.tern — format trit arrays to JSON strings [tier1]
- stdlib/classical/max_flow_edmonds_karp.tern — Edmonds-Karp max flow implementation [tier1]
- stdlib/lib/trit_packing_utils.tern — manual packing of 5 trits into 1 byte (0-242) [tier1]
- stdlib/std/complex_ternary.tern — basic complex number arithmetic using floats [tier1]
- stdlib/tutorials/neural_net_basics_trit.tern — single-layer ternary perceptron tutorial [tier1]
- stdlib/showcase/fluid_diffusion_1d.tern — 1D heat/concentration diffusion simulation [tier1]
- stdlib/core/ternary_parity.tern — balanced ternary checksum modulo 3 [tier1]
- stdlib/core/ternary_multiplier.tern — single-trit multiplication logic [tier1]
- stdlib/classical/min_cut_max_flow_dual.tern — min-cut discovery in residual graphs [tier1]

Compiler/VM observations:
- Fixed-size array literals (e.g., `let a: int[4] = [0, 0, 0, 0];`) trigger saturation behavior in the VM, effectively treating them as `trittensor` even if declared as `int[]`. Workaround: use manual initialization (`let a: int[4]; a[0]=0; ...`) for arrays that must hold values outside the trit range (-1, 0, 1).
- String indexing (`s[i]`) is currently unsupported and triggers a `Runtime type mismatch` (BET-007).
- String concatenation (`+`) and `len(string)` are stable.
- Local array sizes should be slightly larger than the maximum expected index to avoid potential off-by-one or boundary issues in some VM versions.

## 2026-05-02 — stdlib session — 50 files (Round 2)
Dirs covered: stdlib/signal, stdlib/crypto, stdlib/physics, stdlib/finance, stdlib/ai
Files written:
- stdlib/signal/ternary_fft_lite.tern, low_pass_filter_trit.tern, high_pass_filter_trit.tern, trit_wave_generator.tern, convolution_2d_trit.tern, signal_quantizer.tern, trit_noise_generator.tern, amplitude_modulator_trit.tern, phase_shifter_trit.tern, spectrogram_slice_trit.tern
- stdlib/crypto/trit_hash_sponge.tern, lfsr_ternary.tern, feistel_trit_cipher.tern, trit_otp.tern, trit_checksum_32.tern, hmac_trit_lite.tern, trit_permutation_network.tern, secure_trit_compare.tern, diffie_hellman_ternary.tern, trit_shuffle_fisher_yates.tern
- stdlib/physics/quantum_qubit_to_qutrit.tern, fluid_grid_2d.tern, orbital_state_vector.tern, thermal_diffusion_1d.tern, rigid_body_gravity.tern, pendulum_swing_sim.tern, lorentz_attractor_trit.tern, elastic_collision_2d.tern, black_hole_event_horizon.tern, gas_particle_collision.tern
- stdlib/finance/black_scholes_ternary.tern, sharpe_ratio_trit.tern, portfolio_variance_trit.tern, compound_interest_trit.tern, market_impact_sim.tern, order_book_matcher.tern, moving_average_crossover.tern, monte_carlo_price_path.tern, arbitrage_triangular.tern, discounted_cash_flow.tern
- stdlib/ai/ternary_perceptron.tern, backprop_layer_trit.tern, adam_optimizer_trit.tern, q_learning_gridworld.tern, genetic_algorithm_trit.tern, simulated_annealing_trit.tern, decision_tree_entropy.tern, knn_classifier_trit.tern, rbf_kernel_trit.tern, boltzmann_machine_trit.tern

Compiler/VM observations:
- Custom workarounds for 'sqrt' (Newton's method) and 'pow' (loops) are stable for float calculations.
- Tensor literals with float values like '[1.0, 0.0]' should be avoided in favor of manual element assignment due to parser/VM instability in current dev build.
- Ternary FFT (Radix-3) is highly efficient when using native ternary twiddle factors (-0.5 ± 0.866i).
- Fixed-size arrays passed by reference allow for in-place updates (e.g., in phase_shifter_trit.tern), but take care with index bounds.
- 'match' on general integers remains unstable; 'if/else' preferred for safety.
- 'consensus' remains the primary tool for ternary logic 'averaging' and state resolution across crypto and signal modules.

## 2026-05-02 — stdlib session — 50 files (Round 1)
Dirs covered: stdlib/causal, stdlib/lib, stdlib/math, stdlib/classical, stdlib/logic, stdlib/showcase, stdlib/tutorials
Files written:
- stdlib/causal/causal_graph.tern, do_calculus.tern, backdoor_criterion.tern, frontdoor_criterion.tern, intervention_sim.tern
- stdlib/lib/huffman_ternary.tern, trit_one_hot.tern, trit_label_smoothing.tern, heap_priority_queue.tern, lru_cache_trit.tern, bitset_trit_128.tern, circular_buffer_float.tern, trit_rolling_hash.tern, trit_unit_converter.tern
- stdlib/math/trit_matrix_det_3x3.tern, trit_softmax.tern, trit_cross_product.tern, trit_linear_interpolation.tern, trit_convolution_1d.tern, trit_pooling_max.tern, trit_pooling_avg.tern, trit_vector_normalization.tern, trit_fibonacci_iterative.tern, trit_prime_factorization.tern
- stdlib/classical/ternary_search_float.tern, gradient_descent_trit.tern, k_means_trit.tern, naive_bayes_trit.tern, edit_distance_trit.tern
- stdlib/logic/trit_consensus_n.tern, trit_majority_n.tern, trit_conditional_entropy.tern, ternary_equivalence_checker.tern, ternary_half_adder.tern, ternary_full_adder.tern
- stdlib/showcase/rock_paper_scissors_trit.tern, tictactoe_logic_trit.tern, vending_machine_fsm.tern, credit_score_ternary.tern, inventory_reorder_trigger.tern, smart_home_logic.tern, thermal_balance_sim.tern, kinetic_energy_trit.tern, logic_gate_simulator.tern, consensus_voting_sim.tern, priority_scheduler_trit.tern
- stdlib/tutorials/ternary_decision_making.tern, advanced_match_patterns.tern, tensor_manipulation_pro.tern, error_signaling_patterns.tern

Compiler/VM observations:
- Fixed a corrupted cargo registry by removing empty 'hex' crate dir and re-fetching.
- Confirmed 'ternlang' is the binary name produced by 'ternlang-cli' crate.
- Observed 'cast(trit) to int' can maintain saturation behavior in arithmetic; manual 'trit_to_int' with if-branches is safer for multi-class calculations.
- 'pow' built-in with negative integer exponents returns 1.0 (reverted to custom Taylor series for exp_float).
- Float literals are not currently supported in tensor literal initialization (e.g., [1.0, 0.0] fails).
- 'sqrt' built-in currently triggers a stack overflow (BET-013); implemented custom Newton's method sqrt_float as a workaround.
- Array parameters (trit[]) are passed by reference, but returning values from functions that also take array parameters might be unstable in some VM versions (observed count resets in heap_priority_queue.tern).
- 'match' on int literals > 1 is unstable; use 'if/else if' for general integer matching.

## 2026-04-22 — stdlib session — 8 files
Dirs covered: stdlib/classical
Files written:
- stdlib/lib/bitset.tern — simple trit-based bitset structure [tier1]
- stdlib/lib/stack.tern — LIFO stack structure [tier1]
- stdlib/lib/queue.tern — circular queue structure [tier1]
- stdlib/lib/linked_list.tern — arena-based linked list structure [tier1]
- stdlib/std/math_stats.tern — basic statistical utilities [tier1]
- stdlib/classical/bucket_sort_trit.tern — linear trit sorting [tier1]
- stdlib/classical/quick_sort_ternary.tern — recursive quick sort [tier1]
- stdlib/classical/bfs_trit.tern — breadth-first search [tier1]
- stdlib/classical/dfs_trit.tern — depth-first search [tier1]
- stdlib/classical/dijkstra_trit.tern — weighted pathfinding [tier1]
- stdlib/classical/floyd_warshall_trit.tern — all-pairs shortest paths [tier1]
- stdlib/classical/prims_trit.tern — minimum spanning tree [tier1]
- stdlib/classical/kruskals_trit.tern — minimum spanning tree [tier1]
- stdlib/classical/sieve_trit.tern — prime number sieve [tier1]
- stdlib/classical/kmp_search_trit.tern — pattern matching [tier1]
- stdlib/classical/astar_trit.tern — grid search [tier1]
- stdlib/classical/radix_sort_ternary.tern — counting sort optimization [tier1]
- stdlib/classical/topological_sort_trit.tern — graph dependency resolution [tier1]
- stdlib/classical/lcs_trit.tern — longest common subsequence [tier1]
- stdlib/classical/merge_sort_ternary.tern — merge sort [tier1]
- stdlib/classical/selection_sort_ternary.tern — selection sort [tier1]
- stdlib/classical/insertion_sort_ternary.tern — insertion sort [tier1]
- stdlib/classical/shell_sort_ternary.tern — shell sort [tier1]
- stdlib/classical/binary_search_trit.tern — binary search [tier1]
- stdlib/classical/heap_sort_ternary.tern — heap sort [tier1]
- stdlib/classical/fibonacci_search_trit.tern — fibonacci search [tier1]
- stdlib/classical/bellman_ford_trit.tern — graph pathfinding [tier1]

Compiler fixes:
- Fix 'peek_token' and type-parsing to support 'float[N]', 'int[N]', 'trit[N]' in function signatures.
- Reverted unintentional deletions of stdlib/std/logic.tern.

## 2026-04-16 (Claude Sonnet 4.6) — FULL BUG SWEEP — 14 bugs closed, 88/98 probes passing
...
(All previous session logs restored)

## 2026-04-26 — stdlib session — 20 files
Dirs covered: stdlib/lib, stdlib/classical, stdlib/showcase, stdlib/tutorials
Files written:
- stdlib/lib/trit_field.tern — trit-based bit packing utilities [tier1]
- stdlib/lib/circular_buffer_trit.tern — fixed-size trit history buffer [tier1]
- stdlib/lib/de_morgan_trit.tern — verification of ternary de morgan laws [tier1]
- stdlib/lib/hashing_trit.tern — simple trit-based hashing [tier1]
- stdlib/lib/disjoint_set_trit.tern — union-find data structure [tier1]
- stdlib/lib/segment_tree_trit.tern — range query data structure [tier1]
- stdlib/lib/fenwick_tree_trit.tern — binary indexed tree for trits [tier1]
- stdlib/lib/sparse_matrix_trit.tern — sparse COO matrix representation [tier1]
- stdlib/lib/frequency_map_trit.tern — count trit occurrences [tier1]
- stdlib/lib/trit_vector_dist.tern — distance metrics for trits [tier1]
- stdlib/lib/trit_set_operations.tern — ternary set theory demo [tier1]
- stdlib/classical/minimax_trit.tern — ternary decision tree optimization [tier1]
- stdlib/classical/graham_scan_mock.tern — geometric orientation logic [tier1]
- stdlib/showcase/sentiment_analyzer.tern — rule-based ternary NLP [tier1]
- stdlib/showcase/pid_thermal_control.tern — ternary discrete control demo [tier1]
- stdlib/showcase/market_sentiment_sim.tern — ternary financial indicator demo [tier1]
- stdlib/tutorials/error_handling_best_practices.tern — ternary signaling guide [tier1]
- stdlib/tutorials/custom_trit_gates.tern — gate design patterns [tier1]
- stdlib/tutorials/tensor_transformations.tern — tensor indexing patterns [tier1]
- stdlib/tutorials/recursion_vs_iteration.tern — comparative patterns [tier1]

Compiler/VM observations:
- Fixed-size array literals [0, 1, 2] are treated as trittensors and saturate values to trit range. Use manual initialization for int arrays with values > 1.
- 'cast(trit) to int' in function parameters can sometimes maintain trit-like behavior (saturation) in arithmetic. Explicit 'if' based conversion is safer for now.
- 'match' on 'int' literals > 1 might be unstable; 'if/else if' is more robust for general integer matching.

## 2026-04-26 — stdlib session (round 2) — 20 files
Dirs covered: stdlib/lib, stdlib/classical, stdlib/showcase, stdlib/tutorials
Files written:
- stdlib/lib/fletcher_checksum_trit.tern — fletcher-style checksum for trits [tier1]
- stdlib/lib/sliding_window_trit.tern — sliding window sum over trit stream [tier1]
- stdlib/lib/trit_encoding_utils.tern — encode pairs of trits into 9-state int [tier1]
- stdlib/classical/kadane_algorithm_trit.tern — max subarray sum [tier1]
- stdlib/showcase/voting_system_ternary.tern — consensus decision via trits [tier1]
- stdlib/showcase/eco_thermostat_ternary.tern — simple feedback loop [tier1]
- stdlib/showcase/inventory_balancer_ternary.tern — inventory control demo [tier1]
- stdlib/showcase/traffic_flow_ternary.tern — adaptive traffic light demo [tier1]
- stdlib/tutorials/state_machine_patterns.tern — ternary fsm demo [tier1]
- stdlib/tutorials/ternary_memory_management.tern — initialization best practices [tier1]
- stdlib/tutorials/control_flow_ternary.tern — ternary branches and loops [tier1]
- stdlib/tutorials/data_validation_ternary.tern — data validation mapping [tier1]
- stdlib/core/bitwise_ternary.tern — vectorized logic operations [tier1]
- stdlib/core/ternary_latch_advanced.tern — state holding latch logic [tier1]
- stdlib/std/math_algebra.tern — horner's method for polynomials [tier1]
- stdlib/std/trit_cmp.tern — semantic comparison functions [tier1]
- stdlib/lib/trit_histogram.tern — ascii histogram generation [tier1]
- stdlib/lib/array_shift_trit.tern — array shift left/right utility [tier1]
- stdlib/std/math_gcd.tern — euclidean algorithm for gcd [tier1]
- stdlib/core/consensus_chain_trit.tern — chain reduction simulation [tier1]

Compiler/VM observations:
- Bitwise operators like `^` (XOR) might fail parsing, so checksums must rely on pure arithmetic ops `+`, `-`, `*`, `/`, `%`.
- `consensus(1, -1)` correctly evaluates to `0` (Tend). `consensus(1, 0)` correctly evaluates to `1` (Affirm). The array iteration mutations are stable.
- Array parameters pass by reference, enabling modifications without needing to return the whole array.

## 2026-04-29 — [ExaTern SIMD + Zero-Copy + v1.2.1 Sync]
Comprehensive architectural upgrade and ecosystem synchronization.
- **Ecosystem Sync**: Synchronized all workspace crates to version `1.2.1` and published to `crates.io`.
- **Resolved [COMP-TENSOR-001]**: Upgraded `Talloc` to 32-bit (u32) immediates, supporting up to 4.29B elements.
- **Resolved [VM-STRUCT-001]**: Implemented `Value::Struct` and `Tstruct`/`Tfield` for native composite return ABI.
- **ExaTern Performance [SIMD Core]**: Implemented high-efficiency 5-trit-per-byte packing and vectorized opcodes (`TV_ADD`, `TV_NEG`, `TV_CON`) using $243 \times 243$ lookup tables.
- **ExaTern Performance [Zero-Copy]**: Implemented `Value::TensorView` (TVIEW) for slicing and `TBIND` for high-speed in-place register updates.
- **Language Support**: Added `packed trit[N]` types and `tensor[start..end]` slicing syntax to the parser and compiler.
## 2026-05-02 — stdlib session — 10 files
Dirs covered: stdlib/classical, stdlib/lib, stdlib/std, stdlib/showcase, stdlib/tutorials
Files written:
- stdlib/classical/knapsack_ternary.tern — 0/1 knapsack with ternary preference [tier1]
- stdlib/lib/levenshtein_trit.tern — edit distance for trit sequences [tier1]
- stdlib/lib/convolution_trit.tern — 1D convolution for signals [tier1]
- stdlib/std/stats_advanced.tern — variance and Pearson correlation [tier1]
- stdlib/showcase/decision_tree_simple.tern — rule-based adaptive decision system [tier1]
- stdlib/lib/heap_ternary.tern — efficient 3-way branching max-heap [tier1]
- stdlib/tutorials/recurrent_state_trit.tern — stateful logic and feedback loops [tier1]
- stdlib/lib/int_to_ternary.tern — decimal to balanced ternary conversion [tier1]
- stdlib/lib/rle_trit.tern — run-length encoding for trit compression [tier1]
- stdlib/tutorials/decision_loop_pattern.tern — handling uncertainty in loops [tier1]

Compiler/VM observations:
- Built-in `sqrt` causes `Call stack overflow (BET-013)` in current build. Workaround: use `sqrt_approx` (Newton-Raphson).
- `cast(int) / cast(int)` can sometimes result in integer division even when assigned to float. Workaround: force float context with `* 1.0`.
