Charter v0.2: two-track structure for bigger models and J-lens (issue #1)

[horner]

Closes #1

Amends the research charter to v0.2 per the decisions in the issue #1 discussion: adopt Track B, fold Pythia-410M into the authorized repeat, and make Pythia-1B/1.4B conditional on the 410M trend.

Changes

Two-track structure (new §1.2)

• Track A — interoception ladder: unchanged Pythia program, Milestones 0–11 / G00–G11.
• Track B — J-space connection: new Milestones B1–B2 / gates GB1–GB2 on the Gemma family. B1 = behavioral prerequisite on Gemma 2 2B + lens-machinery validation against the published solarkyle/jspace Gemma-4-12B artifacts. B2 = sparse J-decomposition of the mobilization/body_state mediator + the automatic-versus-flexible interoception battery, with mandatory shuffled-lens / rotated-dictionary / norm-matched-random controls and J-clamping mediation tests. Passive J-lens readout is never gate-eligible evidence.

Model ladder (§5)

• Pythia-410M folded into EXP-003-v2 as a third scale point (dated amendment under G02; thresholds committed before its held-out split is scored; GATE-02.md remains frozen).
• Pythia-1B/1.4B registered as a conditional extension under Milestone 9, only if the 410M trend is promising (EXP-017).
• Track B model table: Gemma 2 2B (EmotionScope anchor) and Gemma-4-12B (fitted-lens anchor, cluster-only).

Reproducibility contract for Gilbreth (§4, new §5.2)

• CUDA as a third parity-gated backend; CPU float32 reference moves to cluster CPU nodes for models exceeding 16 GB.
• Run manifests gain gpu, cuda, driver, node_type, slurm_job_id, container_digest (Apptainer required on CentOS 7).
• sbatch scripts must be thin wrappers around the same versioned CLI used locally.
• Cluster scratch/Depot added to the storage policy for fitted lenses and large Track B artifacts.

Vocabulary

• j_space added to docs/glossary.md as "verbalization-poised subspace" with usage requirements; "global workspace" explicitly excluded from accepted vocabulary.

Included documents

• docs/j-space-global-workspace.md (method review that motivated the amendment) and its source PDF.

Reviewer notes

• One judgment call to review: Milestone B2 begins after GB1 and does not hard-depend on Track A's G05, because Track B extracts its own directions on Gemma (EmotionScope-style) rather than reusing Pythia probe directions. This was the unresolved fork 2 from the issue discussion — flag if you want the stricter G05 prerequisite.
• Track B opens only after G02 closes, so EXP-003-v2 remains the sole authorized next work.
• make check and make test pass (44 passed, 2 deselected).