lineage build produces empty graph despite storage data being available

[jakubsebek-kosik]

Describe the bug

kbagent lineage build --output lineage.json produces an empty graph (0 tables, 0 configurations, 0 edges) when only a single project is initialized, even though storage tables are accessible.
The command works correctly when all organization projects are initialized.

Steps to reproduce

1. Initialize and configure the project:

   kbagent init
   kbagent project add --project <project-name> --url ... --token ...
   kbagent sync pull --project <project-name>

2. Verify storage is accessible:

   kbagent storage tables --project <project-name>
   # Returns a non-empty list of tables ✓

3. Run lineage build:

   kbagent lineage build --output lineage.json

4. Observe output:

   Lineage graph built
     Tables: 0
     Configurations: 0
     Edges: 0
     Saved to: lineage.json

Expected behavior

lineage build should use the locally synced project data and produce a graph reflecting the actual tables and configurations present in the project.

Actual behavior

The output JSON contains an empty graph. No tables, configurations, or edges are included, despite storage tables confirming that data exists.

[padak]

Fixed in v0.21.2 via #210 — kbagent lineage build now supports the flat single-project sync layout produced by kbagent sync pull --project foo.

Root cause: scanner previously assumed the nested <alias>/.keboola/ layout from sync pull --all-projects; the flat layout (manifest directly in CWD) had no fallback, so the scan returned 0/0/0 silently. Now _scan_projects detects root/.keboola/manifest.json first and treats the root as the project, then falls back to the nested iteration. As a belt-and-suspenders improvement, build_lineage now emits a warnings[] entry when zero projects are found (both in human and --json output) so a similar silent-empty failure surface is explicit.

Thanks for the clean bug report with the full repro chain (init → project add → sync pull → storage tables ✓ → lineage build ✗) — that made the layout diff immediately visible.

Release: https://github.com/padak/keboola_agent_cli/releases/tag/v0.21.2