Bild: pipelined analyze→build architecture with multi-line UI

Implement STM-based pipeline that allows per-target progression
through build phases (analyze → wait for deps → build) with
concurrent workers.

Key changes: - TargetState enum tracks each target through pipeline
stages - Coordinator manages state, analyze queue, build queue
coordination - pipelineAnalysisWorker/pipelineBuildWorker pull from
queues concurrently - promoteWaiters unblocks targets when their
dependencies complete

UI improvements: - Multi-line mode reserves N lines for N targets,
updates in-place - Remove narrow terminal (<80 col) restriction for
multi-line mode - Add Skipped state with yellow [_] for non-buildable
files - Remove extra blank line at start of output

State symbols: [.] Pending, [+] Analyzing, [~] Building, [✓] Success
(green), [x] Failed (red), [_] Skipped (yellow)

0 files changed, 0 insertions, 0 deletions