Implements F1 pre-flight cache build orchestrator on the operator
workstation. Composes C11 TileDownloader (AZ-316), C12 CompanionBringup
(AZ-327), C12 FlightsApiClient (AZ-489), and the new
RemoteCacheProvisionerInvoker into one sequenced flow guarded by a
filelock-backed workstation-side lockfile.
Architectural decisions:
- Phase-0 flight-resolve runs BEFORE the lockfile (ADR-010): a flight
that cannot be resolved is an operator-input error, not a contended-
resource error. Enforced by AC-11 + AC-14.
- Consumer-side cuts (AZ-507) for C11 + C10 types: local Protocols /
mirror DTOs in tile_downloader_cut.py and _types.py; external errors
matched by name-based whitelisting so unknown exceptions still
propagate per AC-6. Cross-component type translation lives at the
composition root (c12_factory).
- Failure surfacing: recognised operational failures (download error,
companion not ready, build error, flight-resolve error) return as
CacheBuildReport(outcome=failure, failure_phase=...). Only lockfile
contention raises (BuildLockHeldError) since no phase ever ran.
- Workstation-side filelock library (project pin); no custom primitive.
- Remote C10 stdout streamed line-by-line as DEBUG with api_key /
auth_token redacted before logging (defence-in-depth).
- CLI is now a thin adapter; all workflow logic lives in
build_cache.py. operator-tool build-cache exit codes map per
CacheBuildReport.failure_phase + failure_exception_type.
Tests: 116 c12 unit tests pass (29 new for AZ-328 covering 15/15 ACs +
NFR-perf-overhead microbench; 7 new for remote_c10_invoker; 3 new for
file_lock; test_cli_build_cache rewritten for new orchestrator
interface). Full repo suite: 1522 passed, 80 skipped.
Also: replays Batch 42's ruff format leftover for c12 flights_api +
test_az489 files (formatter ran over the c12 directory after new
files were added). Pure whitespace; no behaviour change.
Full report: _docs/03_implementation/batch_43_cycle1_report.md
Co-authored-by: Cursor <cursoragent@cursor.com>
Oleksandr Bezdieniezhnykh