v0.3.0: Typed process layer — families, carriers, operators, scheduling, compilation

What's new

Canvas-engineering gains a typed process layer on top of the existing typed layout:

CanvasProgram layer

• 5 region families: observation, state, memory, residual, action — everything else is tags
• 5 carriers: deterministic, diffusive, filter, memory, residual — not everything follows diffusion dynamics
• Operators: semantic intent (observe, predict, correct, retrieve, write, act) separate from backend (cross_attention, mamba, perceiver, etc.)
• Auto-wiring: compile_program() auto-sets operators from region family pairs
• ClockSpec: periodic, on_event (residual threshold), boundary clocks with cooldown and max_silence

Runtime

• ResidualAccumulator: tracks running scalar EMA summaries of error signals per region
• RegionScheduler: evaluates clock rules to decide which regions fire each step
• AttentionDispatcher.active_regions: skip inactive regions, pass through unchanged

Compilation

• ProgramCompiler: freeze/constant/export/dead-elimination passes
• Per-family learning defaults: ssl_prediction for observation, posterior_match for state, retrieval for memory, calibration for residual, supervised for action

New modules

• program.py — CanvasProgram, RegionProgram, ConnectionProgram, ClockSpec, LearningSpec
• residuals.py — ResidualSpec, ResidualAccumulator
• scheduling.py — RegionScheduler
• learning.py — FAMILY_DEFAULTS, default_learning()
• compiler.py — ProgramCompiler, CompiledProgram

Stats

• 361 tests, all passing
• 122 new tests for v2 features
• All 239 v0.2.0 tests pass unchanged
• Full backward compatibility: compile_schema() unchanged, all existing code works