[felipemontoya]

Generates fake Catalog Pathways and writes them to event_sink.catalog_pathway
from every backend (ClickHouse, Ralph, Vector, chdb/S3, CSV).

• Pathways are spread across the configured orgs and rotate through the Pathway
  Categories (Master's Degree, Annual Training, Professional Certificate), so
  each org gets pathways of different categories.
• New config keys: num_catalog_pathways (default 6, set to 0 to disable) and
  first_catalog_pathway_id (default 100001, kept high so fake ids don't collide
  with real pathways dumped by the LMS).
• CSV backend writes catalog_pathways.csv.gz.
• README and default_config.yaml document the new keys.

Requires the tutor-contrib-aspects migration 0042_event_sink_pathways,
which creates the table. On older Aspects installs, set num_catalog_pathways: 0.

Tests: generator tests cover defaults, the id offset, disabling, and the
org/category spread for 1, 2, 3 and 5 orgs. The CSV backend test checks the
pathway row count.

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[codecov]

Codecov Report

❌ Patch coverage is 97.24138% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.26%. Comparing base (c6b7512) to head (6fb1dfd).

Files with missing lines	Patch %	Lines
xapi_db_load/backends/chdb.py	94.44%	0 Missing and 2 partials ⚠️
xapi_db_load/backends/clickhouse.py	95.83%	0 Missing and 1 partial ⚠️
xapi_db_load/generate_load_async.py	98.03%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
+ Coverage   89.90%   90.26%   +0.35%     
==========================================
  Files          36       36              
  Lines        2843     2988     +145     
  Branches      307      322      +15     
==========================================
+ Hits         2556     2697     +141     
  Misses        260      260              
- Partials       27       31       +4     

Flag	Coverage Δ
unittests	90.26% <97.24%> (+0.35%)	⬆️

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[bmtcril]

One small thing then I can merge and release. This should be a feat!: commit since it writes to tables that don't exist in earlier versions and will require a full version bump.

[felipemontoya]

@bmtcril I squashed the commits and did the fix on the conventional commit