CDR/GTRS simulation Exercise 4: record bundle (code, documents, battery summaries, verification outputs)

# CDR/GTRS Computational Simulation — Exercise 1

A small, transparent, extensible agent-network simulation for asking whether
CDR/GTRS-like dynamics (coherence → disruption → reorganisation →
recoherence) *emerge* from simple relational and resource constraints — or
fail to, or are explained by something else.

## Exercise 2 (v0.2.0) — targeted disruption × adaptation delay

Exercise 1 is preserved unchanged (git tag `exercise1_v0.1.0`,
`archive/exercise1_v0.1.0.zip`; `python verify_exercise1.py` regenerates
stored Exercise 1 runs bit-for-bit with the current code). 

## Exercise 3 (v0.3.0) — need decoupling, producer-matched removal, extinction label

Exercise 3 adds a decoupled adaptation need (`need_persistence_ticks`),
producer-count-matched random removal, an explicit `FUNCTIONAL_EXTINCTION`
outcome with `extinct`/`extinction_tick` summary columns, and an
initial-reserve-heterogeneity probe; `python verify_exercise2.py` is the
regression gate proving legacy v0.2.0 runs still reproduce bit-for-bit
(`run_exercise3.py --dry-run` lists the 8,000-run grid). See
`docs/EXERCISE3_CHANGES.md`.