settled-reach/tooling/DOMAINS.md

The domain map (T-1271, D-263)

Every Python file and every executable in tooling/, assigned to a domain before anything moves. This is the artefact the per-domain port tickets are written from — without it their boundaries would be guesses, renegotiated halfway through the move.

Status: map only. Nothing here has moved yet except check client-version, which shipped in T-1262 as the reference implementation.

What the survey changed

Two corrections to the T-1250 description, both found by counting rather than reading:

• Three Rust crates, not one. econ-sim, line-previewer and test-client are all Cargo projects with zero .py files. None is renamed and none moves; a hyphen only matters for something Python must import.
• The "28 singleton prefixes" were an artefact of my own measurement. Splitting filenames on the first token scattered coherent families: sculpt-star-map, tune-star-map-topology and generate-star-map* are one group, not three orphans. Counting families instead of prefixes, the genuinely ambiguous set is small and is listed under Judgment calls below.

And two found while reading the tree:

• garment-fit/ is mostly a Blender payload directory. 22 of its 23 files are blender_author_*.py, leaving one real module. So the Blender carve-out is 35 files, not the 13 visible at top level — the T-1250 description was right about 35 and an intermediate survey of mine was wrong, because it counted only the top level. The consequence is not cosmetic: character is a much smaller domain than the directory sizes imply, and the carve-out is much larger.
• tooling/db/ is misnamed. It holds the audio/image/Trellis connectors and wiki_sync.py — the actual database work is in economy-db/. Naming a domain db after that directory would carry the misnomer forward, so its contents split between assets and wiki instead.

Domains

domain	what it is	sources
check	repo consistency gates the push hook runs	check-client-version ✅, check-canvas-version, check-systems-db-stamp, check-fact-ids, check-dataflow-graph.py
validate	content and schema validation	validate-content, validate-checklist, validate-ron
atlas	the Atlas map data surface	atlas, atlas-check, atlas-names, atlas-commit-and-sync, atlas-systems-done, atlas-update-field, atlas-verify, atlas-flatness
starmap	the star map and its renders	generate-star-map.py, generate-star-map-data.py, generate-star-map-svg.py, sculpt-star-map.py, tune-star-map-topology.py, star-map-seed.json
planet	planetary generation and its guards	planet-gen/ (30 files)
db	the economics DB pipeline	economy-db/ (17 files), schema_version.py
wiki	wiki sync and content maintenance	wiki/, db/wiki_sync.py, db/populate_gttr_hook.py, db/backfill_cultural_corridor.py, assign-astro-ids.py, fill-missing-globes.py, migrate-s-to-gj.py, patch-core-sector.py, process-wiki-system-changes
assets	connectors to the tower-of-joy generators	db/audio_*.py, db/audio-*, db/image_connector.py, db/trellis_connector.py, db/common.py, trellis-batch.sh, synth_ui_sounds.py
character	bodies, garments, GLB handling	garment-fit/make_logo.py, garment-qa/analyze_captures.py, convert_outfit.py, glb_strip_utility_nodes.py, inspect_glb.py, check_hair_symmetry.py, check_icosphere.py, render_quaternius_test.py, setup_clothing_metadata.py — note this is far smaller than garment-fit/'s file count suggests; 22 of its 23 files are Blender payloads and belong to the carve-out
visual	screenshot and render comparison	visual-diff, visual-thumbnail, visual-blank-check
godot	Godot parse and cold-start checks	godot-parse-sweep, godot-cold-parse
generate	content generators not owned elsewhere	generate-brands, generate-corporations, generate-character-manifest, generate_corp_stubs.py
dev	developer environment and workflow	install-rust, install-godot, worktree-setup, perf-baseline, clerk-review
pr	the PR/review loop	tea-comment, pr-watchlist-diff, pql-board-html
blender	carve-out — payloads run by Blender	35 blender_*.py (13 top-level + 22 in garment-fit/), blender wrapper → tooling/scripts/blender/

Judgment calls, with reasons

Each of these sets a precedent, so the reasoning matters more than the answer.

Registries stay module-level data, not commands. canvas_sources.py and generator_sources.py are lists of paths consumed by gates — nothing types them. They move beside the domain that reads them (check and db respectively) as plain modules, not verbs. Making them commands would put something in reach --help that answers no question a person has.

schema_version.py belongs to db, and check imports it. It is consumed by the economics importer and by the stamp gate. Shared, but not equally owned: the importer defines the version, the gate reads it. It goes where it is defined, and the cross-domain import is legitimate — that is what a service layer is for.

test_*.py files do NOT become a domain. They are gate tests run by make test-tooling, not commands anyone types. reach test … would imply a test runner that does not exist. They stay standalone scripts.

pql-migrate/ is provenance, not tooling. One-shot scripts from a completed migration, already documented as such in .claude/rules/project-structure.md. They are not live tools and must not become verbs. Move to tooling/archive/, excluded from package discovery — deleting them would destroy migration provenance, and keeping them importable would imply they still run.

pr is a domain the epic did not list. tea-comment and pr-watchlist-diff are the PR/review loop, which is neither dev (environment setup) nor anything else on the original list. Folding them into dev would make dev the drawer everything ambiguous goes into — which is how core/ rots, and the same argument applies here.

atlas is overloaded, and the port must not merge the three uses. The word appears in three unrelated places: the top-level atlas-* executables (the map data surface), planet-gen/atlas_*.py (atlas_cohesion_audit, atlas_common, atlas_quality_analysis — quality analysis of generated terrain), and economy-db/atlas.py (the atlas index tables in systems.db). These are three concerns sharing a noun, not one domain in three places. Each stays with its owner — atlas, planet and db respectively — and the port should resist the pull to collect them, which would produce a domain whose only common thread is a word.

economy-db/errors.py predates core/errors.py and is not the same thing. Domain-local error types are fine; what must not happen is a silent merge, or a second ReachError with different semantics. Reconcile explicitly when db is ported.

character rather than garment. D-263's sketch says garment, but the files cover bodies, hair, GLB utilities and Quaternius imports as well as clothing. Naming it for one of its five concerns would leave the other four looking misfiled.

Not moving

what	why
econ-sim/, line-previewer/, test-client/	Rust crates. Excluded from package discovery; hyphens are harmless.
scripts/blender/ (after T-1273)	Run under Blender's bundled Python; cannot import tooling.core. Excluded from the conformance scope for the same reason.
archive/ (was pql-migrate/)	Completed-migration provenance.
test_*.py	Gate tests, not commands.

Naming, applied on the way in

• Modules snake_case: check-dataflow-graph.py → dataflow_graph.py.
• Verbs kebab-case: reach check dataflow-graph.
• No prefix-as-namespace. The domain directory supplies what the blender_, atlas- and check- prefixes were doing by hand. atlas-verify becomes reach atlas verify, not reach atlas atlas-verify.
• Layering is a vocabulary, not a quota. A domain with only a router and a service gets exactly those two files. Empty schemas.py and dependencies.py are worse than absent ones — they suggest a shape the domain does not have.