refactor(tooling): T-1289 — economy-db becomes reach ledger

The sole generator of systems.db moves to tooling/domains/ledger/ and is
now `reach ledger import`. economy_import/ keeps its name (Rust comments in
server/src cite it); the entrypoint becomes service.py; schema_version.py
moves with the importer, which is where the version is defined.

The stamp survived the move, which is the thing that had to hold:

- generated_brands.toml is byte-identical (sha256 e748531…) before and after
- `reach check systems-db-stamp` reported STALE after the move (the registry
  saw it) and OK after the regen
- the dry-run carries every count and warning of the baseline transcript,
  and exit 2 — imported and stamped, coverage gate unmet — still reaches the
  caller through @command

`make regen-db` survives as a one-line delegate, per D-263's muscle-memory
clause: about fifty files name it, including the headers of generated wiki
TOMLs and the remedies the push gate prints. `make economy-db` is retired;
it ran `reach generate brands` before the import, which the import already
does as its first step.

economy_import.errors is reconciled as DOMAINS.md asked. ImportAborted stays
as internal rollback control flow and never reaches a caller; the service
converts it to a ReachError carrying the remedy.

regenerate_brands caught cargo_binary's ReachError, printed it and raised
ImportAborted, dropping the remedy. It runs before the import transaction
opens, so there is nothing to roll back — it now propagates.

Both sys.path bootstraps are gone; they existed only because the directory
was hyphenated. The step labels ran [1/10]…[10/13]…[17/19]; one 24-step
counter now drives the event phase and progress.

Stale pointers fixed on the way: MIGRATION_SQL has lived in
economy_import/migration.py since T-1067, but the asset-pipeline rule,
DEVOPS and the schema comments still sent readers to import_economics.py;
the rule and DEVOPS also still named the check scripts T-1281 retired.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tooling/generator_sources.py

@@ -5,20 +5,21 @@ generator_sources — single source of truth for systems.db generator source set
 Each generator that writes a stamp row to systems.db's ``meta`` table records the
 SHA-1 of the concatenated bytes of its source files (sorted by path).  This module
 is the ONE place that defines which files belong to each generator's stamped set
-(T-1067).  It replaces the formerly triplicated lists in:
-
-  - ``IMPORT_ECONOMICS_SOURCES`` in tooling/economy-db/import_economics.py
-  - ``GENERATOR_SOURCES`` in tooling/check-systems-db-stamp
-  - the hardcoded watch list in .claude/skills/pr-process/SKILL.md
-    (now derived via ``python3 tooling/generator_sources.py --list``)
+(T-1067).  It replaced three formerly separate lists (in the importer, in the
+old check-systems-db-stamp script, and in the pr-process skill).
 
 Consumers:
-  - tooling/economy-db (the importer) — imports ``IMPORT_ECONOMICS_SOURCES`` and
-    ``file_sha1`` to write the stamp after a successful run.
-  - tooling/check-systems-db-stamp — imports ``GENERATOR_SOURCES`` and
+  - the ledger importer (tooling/domains/ledger/) — imports
+    ``IMPORT_ECONOMICS_SOURCES`` and ``file_sha1`` to write the stamp after a
+    successful run.
+  - ``reach check systems-db-stamp`` — imports ``GENERATOR_SOURCES`` and
     ``file_sha1`` to verify the stamp before a push.
+  - ``reach pr watchlist-diff`` — reads ``GENERATOR_SOURCES`` for its watch set.
   - /pr-process (skill) — shells out to the ``--list`` CLI for its watch list.
 
+Stays a module rather than a verb (tooling/DOMAINS.md): it is a list of paths
+read by gates, and nothing types it.
+
 This file is itself a member of the stamped source set: a registry change (adding
 or removing a source) must flip the stamp and force ``make regen-db``, otherwise
 edits to the list would be invisible to staleness detection.
@@ -44,10 +45,10 @@ REPO_ROOT = Path(__file__).resolve().parent.parent
 
 # Entrypoint + split module package (T-1067).
 IMPORT_ECONOMICS_ENTRYPOINT: Path = (
-    REPO_ROOT / "tooling" / "economy-db" / "import_economics.py"
+    REPO_ROOT / "tooling" / "domains" / "ledger" / "service.py"
 )
 ECONOMY_IMPORT_PACKAGE_DIR: Path = (
-    REPO_ROOT / "tooling" / "economy-db" / "economy_import"
+    REPO_ROOT / "tooling" / "domains" / "ledger" / "economy_import"
 )
 
 # Rust sources for the generate_brands subroutine.  import_economics runs the
@@ -163,7 +164,7 @@ def _corporation_pages() -> tuple[Path, ...]:
 
 # Canonical source set for import_economics' meta stamp.  Covers the Python
 # entrypoint and its module package, the Rust binary it invokes (generate_brands
-# main.rs + names.rs + surname corpus + wrapper script), the shared schema
+# main.rs + names.rs + surname corpus + core/process.py), the shared schema
 # version constant, the authored data TOMLs, the corp wiki pages whose
 # frontmatter the importer bakes (T1, PR #177), and this registry itself.
 IMPORT_ECONOMICS_SOURCES: tuple[Path, ...] = (
@@ -175,7 +176,7 @@ IMPORT_ECONOMICS_SOURCES: tuple[Path, ...] = (
     GENERATE_BRANDS_NAMES_RS,
     GENERATE_BRANDS_SURNAMES_RS,
     REPO_ROOT / "tooling" / "core" / "process.py",  # runs the brand binary (T-1286)
-    REPO_ROOT / "tooling" / "schema_version.py",
+    REPO_ROOT / "tooling" / "domains" / "ledger" / "schema_version.py",
     SPECIALIZATION_VOCAB_TOML,
     SYSTEM_SPECIALIZATION_TOML,
     CORP_HQ_PLACEMENT_TOML,
@@ -198,7 +199,7 @@ IMPORT_ECONOMICS_SOURCES: tuple[Path, ...] = (
 # The atlas geometry generator (generate_atlas) was retired in #951 (D-223).
 # import_economics is now the sole regen-db generator that writes systems.db; it
 # owns the atlas index (names-only pool + empty geometry tables).  The surviving
-# planet-gen importers (import_heightmaps, import_province_boundaries) are
+# `reach atlas planet` importers (import-heightmaps, import-provinces) are
 # one-time build imports baked into the committed DB, not part of regen-db, so
 # they are intentionally not stamped here.
 GENERATOR_SOURCES: dict[str, tuple[Path, ...]] = {