dangernoodle-io / breadboard / 29714044179

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feat: multi-root component discovery for consumer codegen (B1-1084) (#954)

- [discovery] extra_roots (bbtool.toml, resolved relative to the toml's
  own dir) + repeatable --extra-root CLI flag on `bbtool codegen`; root
  order = [--root] + toml extra_roots + CLI extra_roots, no
  shadow/priority (collision stays a hard CollisionError, B1-979 model)
- boards.derive_component/build_graph, composition.resolve_composition*,
  and commands.wire._component_headers/collect_entries/
  collect_provides_entries now resolve each component against ITS OWN
  owning root (discovery.ComponentEntry.root), not a single passed root
  -- the load-bearing multi-root fix
- src_file on parsed markers (feeds generated bb_app_init.c comments +
  codegen stdout) stays repo-root-relative for the primary root, becomes
  absolute for a non-primary root (avoids cross-root path ambiguity)
- commands/codegen.py catches discovery.CollisionError alongside the
  other resolution errors, so a collision prints a clean
  "bbtool codegen: error: ..." line instead of a raw traceback
- add codegen.pio_main(env, root, board, config) entry point, mirroring
  version/scaffold's pio_main shape, anticipating B1-1085's PlatformIO
  wiring (not called by bbtool_pio.py yet)
- single-root invocations (no [discovery] table, no --extra-root) stay
  byte-identical -- verified via floor-gen/smoke-gen-esp32 diffed against
  a scratch origin/main checkout (PYTHONHASHSEED=0 pinned both sides)


Claude-Session: https://claude.ai/code/session_01VA9XvWjJcbAUGCZpSFfp3H

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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