Amendment — Planck Information Substrate

What changed

The methodology's physics-level substrate, previously called the Dirac Information Substrate, is renamed to the Planck Information Substrate. The rename applies to:

• The substrate's name in Paper 13 (the paper carrying the analysis).
• The substrate's name in cross-paper references (Paper 5 outline, Paper 8 outline).
• The substrate's name in the canonical physics-domain analyses in physics_domain_analysis/.
• The substrate's name in active working notes, recent session-closes, and tracking surfaces (STATUS.md, critical-analysis-parallel-projections, etc.).
• The substrate's name in the memory files referencing it.

What did not change

• The substrate's primitive set: ${C_f, A_m, E_v, S_p, G_m, E_t}$ — Configuration, Amplitude, Evaluator, Spectrum, Geometry, Entanglement. All six primitives, their dependencies, partial levels, and analyses are preserved exactly.
• The substrate's filter stringency (~18.75%), heavy-pair ratio (~47%), core triad, and other quantitative outputs.
• The spectral-triple framework as the candidate mathematical realization. The spectral triple is one mathematical framing of the substrate; the rename does not commit the substrate to it.
• The Dirac operator as the candidate evaluator. The Dirac operator remains the specific mathematical object playing the evaluator role within the spectral- triple framing. The rename moves "Dirac" out of the substrate name but leaves it as the name of the specific evaluator candidate.
• Other physics terminology (Dirac equation, Fermi-Dirac, Dirac 1928, etc.) is preserved — these are established physics terms, unrelated to the substrate-name rename.

Why

The earlier name, "Dirac Information Substrate," embedded the Dirac operator into the substrate's identity. This had two problems:

1. Over-commitment to a specific operator framing. The Dirac operator is one candidate evaluator within the spectral-triple framework, which is in turn one candidate framing of the physics substrate. If the spectral-triple framing or the Dirac-operator-as-evaluator choice turns out to be wrong, the substrate name would have to change with it. The substrate is the underlying thing; the operator is one mathematical handle on it.

2. Planck is the more accurate primordial reference. The Planck quantum of nature (Planck length, Planck time, Planck energy) is the physical scale at which the underlying carrier sits. "Planck information substrate" denotes the substrate at the scale of physical reality without committing to a particular operator framing. Planck units are well-established and independent of any specific quantum-gravity program; the name remains stable as the operator framing evolves.

The rename is therefore a separation of two concerns: the substrate (now Planck) and the evaluator (Dirac operator, candidate). The Dirac operator remains the specific candidate mathematical evaluator; the Planck substrate is the underlying thing the operator is a candidate description of.

Scope of this rename pass

This amendment lands the rename in:

• Paper 13 (live paper content)
• Paper 5 and Paper 8 outlines (cross-references)
• STATUS.md and active tracking surfaces
• The critical-analysis working note from
• The canonical physics-domain analyses
• The active session-close and retrospective working notes
• The memory files referencing the substrate name

Coordinated refactor landed

The deferred data + script rename listed below as out-of-scope landed as Stage 2 of the compute methodology sweep:

• Data files renamed: data/domains/dirac-substrate.v1.json → data/domains/planck-substrate.v1.json; data/walks/dirac-substrate-min-to-max.v1.json → data/walks/planck-substrate-min-to-max.v1.json; data/bridges/dirac-to-chemistry-bridge.v1.json → data/bridges/planck-to-chemistry-bridge.v1.json. Cross-references in 7 other data files (cross-arrangement-substrate, biology topology, biology arrangement, cognition arrangement, chemistry domain, developer-keypress event, spoken-utterance event, abiogenesis-r0) also updated.
• Compute scripts updated: 5 scripts had hardcoded "dirac-substrate" references (analyze_bridge_fingerprint, plot_sc4_event_topology, topology_dot, plot_cross_xgenesis_residuals, plot_trajectory_regimes).
• Validation: schema validation, bound check, lattice enumeration, and invariant check all pass with zero regression.
• Legacy data moved: data-legacy/ and data-legacy-2/ moved to archive/data-legacy/ and archive/data-legacy-2/. The frozen records inside (including the old data-legacy-2/domains/dirac-substrate.json) are preserved as historical reference with their READMEs intact.

Still out of scope (regenerate, do not rename)

• Generated outputs in output/results/dirac-substrate-*.v1.json and output/figures/dirac-substrate-*.png. These will be regenerated under the new names as part of Stage 4 figure regeneration.
• Output legacy in output/results-legacy/ and output/figures-legacy/. Frozen reference; not candidates for rename.
• Archived session-close docs in archive/, the v1 analyses in v1_revision/, and the older summary docs in summary/. These describe what was thought at the time and are historical records; renaming them would distort the record.

Each of these locations should be read with the understanding that "dirac-substrate" and "Dirac Information Substrate" refer to what is now called the Planck Information Substrate. The substantive content is preserved unchanged.

Reading the corpus during the transition

For any reader (human or LLM context) encountering both names in the corpus:

• "Planck Information Substrate" is the canonical name as of.
• "Dirac Information Substrate" appearing in archive/v1/legacy contexts refers to the same substrate under its earlier name.
• "Dirac operator" remains a specific candidate evaluator within the substrate and is unchanged.

The renames in the live papers, canonical analyses, and active working notes are complete; the deferred renames in data files, scripts, and outputs do not risk the old name slipping into a paper because those locations are not paper-content surfaces.

Future operator-framing changes

A consequence of separating substrate and evaluator names: if the underlying physics framing changes — e.g., if the spectral-triple framework is displaced by a different candidate mathematical realization (causal sets, spin foams, asymptotic safety, etc.) — the substrate name does not need to change with it. "Planck information substrate" remains a stable name for the underlying thing; only the specific evaluator candidate and the operator-level description would update. This stability is the central motivation for the rename.