refactor(tooling): T-1288 — planet-gen becomes reach atlas planet

The 30-file tree moves under atlas as its third rung (D-243), ten verbs
fronting it. Each verb restates its module's options so `--help` describes
something; tooling/test_planet_router.py hands every declared option to the
module's own argparse and fails on drift, and now runs in make test-tooling.

The 2026-09-02 half of this move had converted the top-level imports and the
repo roots. Finishing it found what the half-move left:

- Lazy in-function imports, and all of sol_data/, still named siblings bare.
  They resolved only through sys.path.insert hacks, so under reach the first
  globe render in generate, batch or sol-import would have raised
  ModuleNotFoundError. Qualified; the hacks are gone.
- 247 print() calls and a stdout progress writer that fired once per 8 KB
  block. Report verbs (audit, quality) write through console.out, progress
  through console.event, and download progress is throttled to 10% steps
  so a job log is not tens of thousands of lines.
- Every error exit raises ReachError with a fix.

Two checks that could not fail:

- batch --verify-determinism printed a warning and exited 0 on a mismatch.
- import-provinces exited 0 with errors > 0.

Both now raise. The 271-body bake is only safe to re-run because the first
one holds.

sol-import --body is action="append" in the module but the router took one
value, so --body GJ0d --body GJ0e kept one. Now repeatable, and _flags repeats
list options.

test_conformance walked one level, so a nested group was reported as a verb
missing @command and its ten verbs were never checked. It recurses now;
proven by stripping @command from `planet quality` and watching it fail.

Stray PNGs from the 2026-09-03 runaway router-test run are parked in
.cache/t1288-stray-pngs/, not committed. Their reliefmaps differ from HEAD
while the heightmap regenerated byte-identical — filed as T-1291.

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

tooling/test_conformance.py

@@ -231,18 +231,26 @@ from tooling.core.command import MARKER
 from tooling.main import DOMAINS, _load_domain
 
 report = []
-for name in sorted(DOMAINS):
-    group = _load_domain(name)
-    ctx = None
-    for verb in group.list_commands(ctx):
-        cmd = group.get_command(ctx, verb)
+
+def walk(name, group, prefix):
+    # A nested group (`atlas planet`) is not a verb: its callback only keeps it
+    # a group. Recurse into it instead, so the verbs underneath are held to the
+    # contract too -- a one-level walk reported the group and skipped all ten.
+    for verb in group.list_commands(None):
+        cmd = group.get_command(None, verb)
+        if hasattr(cmd, "list_commands"):
+            walk(name, cmd, prefix + verb + " ")
+            continue
         callback = getattr(cmd, "callback", None)
         report.append({
             "domain": name,
-            "verb": verb,
+            "verb": prefix + verb,
             "decorated": bool(getattr(callback, MARKER, False)),
             "help": (cmd.help or cmd.short_help or "").strip(),
         })
+
+for name in sorted(DOMAINS):
+    walk(name, _load_domain(name), "")
 print(json.dumps(report))
 """
     result = subprocess.run(