Archive 4 more null-result eco_evolutionary modules to PredPreyGrass-archive

eco_evolutionary_cadence (Trial 1, rejected), eco_evolutionary_cooperation (Trial 5, likely
null, paused), eco_evolutionary_metabolic_code (Trial 7, null and reversed on the headline
metric), eco_evolutionary_metabolic_rate (Trial 3, null after proper 3-seed replication).
Confirmed via grep: zero external Python imports of any of the four from elsewhere in the
repo, and neither eco_evolutionary_metabolic_rate_positive_control nor eco_evolutionary_erl_baldwin
(both kept) structurally depend on them beyond prose 'cloned from' mentions. Moved via git
subtree split (full history preserved) to PredPreyGrass-archive, which now holds 7 archived
modules total. Kept: eco_evolutionary (base scaffold), eco_evolutionary_investment (mixed/
inconclusive, not a clean null), eco_evolutionary_metabolic_rate_positive_control (fed directly
into erl_baldwin's design), eco_evolutionary_erl_baldwin and eco_evolutionary_erl_flagship
(the project's strongest results). Updated the two places that linked to the four
(predpreygrass/evolutionary/README.md, EXPERIMENTS.md).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: doesburg11

EXPERIMENTS.md

@@ -17,17 +17,17 @@ These environments layer a genuine evolutionary algorithm — founder genome, mu
 
 * **[Eco-evolutionary](predpreygrass/evolutionary/eco_evolutionary)**: baseline of the family. Evolves a `speed` trait that sets a movement-distance threshold (1 vs. 2 tiles per move).
 
-* **[Eco-evolutionary cadence](predpreygrass/evolutionary/eco_evolutionary_cadence)**: evolves the same `speed` trait, expressed as a graded movement cooldown instead of a discrete distance threshold.
+* **[Eco-evolutionary cadence](https://github.com/doesburg11/PredPreyGrass-archive/tree/main/eco_evolutionary_cadence)** *(archived — rejected)*: evolves the same `speed` trait, expressed as a graded movement cooldown instead of a discrete distance threshold.
 
-* **[Eco-evolutionary cooperation](predpreygrass/evolutionary/eco_evolutionary_cooperation)**: evolves a `cooperation_rate` trait — the fraction of an agent's net energy gain donated to nearby same-species agents, relying on spatial viscosity (offspring spawn near parents) for implicit kin selection.
+* **[Eco-evolutionary cooperation](https://github.com/doesburg11/PredPreyGrass-archive/tree/main/eco_evolutionary_cooperation)** *(archived — likely null, paused)*: evolves a `cooperation_rate` trait — the fraction of an agent's net energy gain donated to nearby same-species agents, relying on spatial viscosity (offspring spawn near parents) for implicit kin selection.
 
 * **[Eco-evolutionary investment](predpreygrass/evolutionary/eco_evolutionary_investment)**: evolves an `offspring_investment_fraction` trait — how much energy a parent hands each offspring at birth.
 
-* **[Eco-evolutionary metabolic rate](predpreygrass/evolutionary/eco_evolutionary_metabolic_rate)**: evolves a `metabolic_rate` trait that symmetrically scales both energy gain and basal energy cost.
+* **[Eco-evolutionary metabolic rate](https://github.com/doesburg11/PredPreyGrass-archive/tree/main/eco_evolutionary_metabolic_rate)** *(archived — null)*: evolves a `metabolic_rate` trait that symmetrically scales both energy gain and basal energy cost.
 
 * **["Stag hunt" nature + nurture](predpreygrass/evolutionary/stag_hunt_forward_view_nature_nurture)**: a hybrid case — predators carry a heritable cooperation trait (nature) alongside the learned voluntary `join_hunt` action (nurture); team-capture success depends on both.
 
-* **[Eco-evolutionary metabolic code](predpreygrass/evolutionary/eco_evolutionary_metabolic_code)**: replaces the earlier single continuous-scalar traits with a combinatorial, needle-in-haystack metabolic code, testing whether selection can find a rare high-fitness combination that smooth-scalar traits couldn't drift toward.
+* **[Eco-evolutionary metabolic code](https://github.com/doesburg11/PredPreyGrass-archive/tree/main/eco_evolutionary_metabolic_code)** *(archived — null, reversed on the headline metric)*: replaces the earlier single continuous-scalar traits with a combinatorial, needle-in-haystack metabolic code, testing whether selection can find a rare high-fitness combination that smooth-scalar traits couldn't drift toward.
 
 * **[Eco-evolutionary metabolic rate — positive control](predpreygrass/evolutionary/eco_evolutionary_metabolic_rate_positive_control)**: a deliberate positive control — clones `eco_evolutionary_metabolic_rate` with a sharpened, super-linear fitness gradient, to check whether the pipeline can detect selection-driven drift at all when the advantage is overwhelming.
 

predpreygrass/evolutionary/README.md

@@ -37,29 +37,19 @@ sustainability numbers.
 
 * **[eco_evolutionary](eco_evolutionary)** — baseline of the family. Evolves a `speed`
   trait that sets a movement-distance threshold (1 vs. 2 tiles per move).
-* **[eco_evolutionary_cadence](eco_evolutionary_cadence)** — evolves the same `speed`
-  trait, expressed as a graded movement cooldown instead of a discrete distance
-  threshold. *Rejected* — the cadence mechanic itself structurally prevents predators
-  from sustaining a population.
-* **[eco_evolutionary_metabolic_rate](eco_evolutionary_metabolic_rate)** — evolves a
-  `metabolic_rate` trait that symmetrically scales both energy gain and basal energy
-  cost. Sustainability/coexistence solved; selection-driven drift **null** after
-  replication.
+* **Moved to [PredPreyGrass-archive](https://github.com/doesburg11/PredPreyGrass-archive)** —
+  `eco_evolutionary_cadence` (Trial 1, rejected — the movement-cadence mechanic itself
+  structurally prevents a sustainable predator population), `eco_evolutionary_cooperation`
+  (Trial 5, likely null, paused after Pilot 1), `eco_evolutionary_metabolic_code` (Trial 7,
+  complete, null and reversed on the headline metric), and `eco_evolutionary_metabolic_rate`
+  (Trial 3, null after proper 3-seed replication — this is also where the project's
+  drift-vs-control replication methodology was built). All four reached a real, concluded
+  null result with nothing to build on and were archived to keep this repo uncluttered. Full
+  code, tests and commit history preserved there; see that repo's README for what each found.
 * **[eco_evolutionary_investment](eco_evolutionary_investment)** — evolves an
   `offspring_investment_fraction` trait — how much energy a parent hands each offspring
   at birth. Sustainability/coexistence solved; selection-driven drift **null** after
   replication.
-* **[eco_evolutionary_cooperation](eco_evolutionary_cooperation)** — evolves a
-  `cooperation_rate` trait — the fraction of an agent's net energy gain donated to
-  nearby same-species agents, relying on spatial viscosity (offspring spawn near
-  parents) for implicit kin selection. Pilot result: likely null; *paused* rather than
-  replicated further — see `RESULTS.md`.
-* **[eco_evolutionary_metabolic_code](eco_evolutionary_metabolic_code)** — evolves a
-  combinatorial `loci` genome (CORRECT/WRONG/PLASTIC per locus, Hinton & Nowlan 1987
-  needle-in-haystack design) instead of a smooth scalar, resolved each lifetime by a
-  genuine per-individual search decoupled from the shared PPO policy.
-  Sustainability/coexistence solved; selection-driven drift **null (reversed on the
-  headline metric)** after replication — see `RESULTS.md`.
 * **Moved to [PredPreyGrass-archive](https://github.com/doesburg11/PredPreyGrass-archive)** —
   `eco_evolutionary_cultural_plasticity` (Trial 8, gene-culture coevolution/dual
   inheritance), `eco_evolutionary_cultural_plasticity_seasonal` (Trial 9, the same