refactor: move source tree into work/, multi-stage Docker build, fix satpass

- Move all application source (meshai/, dashboard-frontend/, tests/,
  config/, docs/, Dockerfile, etc.) into work/ directory
- Add Node.js multi-stage build to Dockerfile for frontend compilation;
  remove compiled static assets from git tracking
- Fix satpass missing time windows: consolidation was splitting wire on
  newline and only putting line 1 in event.title, dropping the time
  window line that the composer uses for precomposed broadcasts
- Fix satpass burst flooding: stagger consolidation timers (+60s per
  pending pass) so Central batch publishes don't blast the mesh
- Update CI workflow build context to work/
- Anchor lib/ and data/ gitignore patterns to repo root to prevent
  false matches on nested directories
- Add dashboard-frontend/node_modules/ to .dockerignore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

work/tests/test_config_source_field.py

@@ -0,0 +1,50 @@
+"""v0.4 C.1: per-adapter `source` field + CentralConsumerConfig."""
+
+import pytest
+
+from meshai.config import (
+    NWSConfig, FIRMSConfig, USGSQuakeConfig,
+    EnvironmentalConfig, CentralConsumerConfig,
+)
+
+_ADAPTERS = ("nws", "swpc", "ducting", "fires", "avalanche",
+             "usgs", "usgs_quake", "traffic", "roads511", "firms")
+
+
+def test_source_defaults_native():
+    assert NWSConfig().feed_source == "native"
+    assert FIRMSConfig().feed_source == "native"
+    assert USGSQuakeConfig().feed_source == "native"
+
+
+def test_all_adapters_default_native():
+    env = EnvironmentalConfig()
+    for attr in _ADAPTERS:
+        assert getattr(env, attr).feed_source == "native", attr
+
+
+def test_source_central_validates():
+    assert NWSConfig(feed_source="central").feed_source == "central"
+    assert USGSQuakeConfig(feed_source="central").feed_source == "central"
+
+
+def test_source_garbage_rejects():
+    with pytest.raises(ValueError):
+        NWSConfig(feed_source="garbage")
+    with pytest.raises(ValueError):
+        FIRMSConfig(feed_source="")
+
+
+def test_environmental_has_central_default():
+    env = EnvironmentalConfig()
+    assert isinstance(env.central, CentralConsumerConfig)
+    assert env.central.enabled is False
+    assert env.central.url.startswith("nats://")
+
+
+def test_source_field_survives_dict_coercion():
+    """A `source` in yaml/dict is coerced onto the adapter config."""
+    from meshai.config import Config, _dict_to_dataclass
+    cfg = _dict_to_dataclass(Config, {"environmental": {"usgs_quake": {"enabled": True, "feed_source": "central"}}})
+    assert cfg.environmental.usgs_quake.feed_source == "central"
+    assert cfg.environmental.nws.feed_source == "native"  # untouched default