chore(metrics,aggregation): promote to Beta with coverage tests

[emjay0921]

Why is this change needed?

Promote spp_aggregation, spp_metrics_core, and spp_metrics_services from Alpha to Beta status after code review confirmed they are clean and production-ready.

How was the change implemented?

• Updated development_status from "Alpha" to "Beta" in all three module manifests
• Added readme/DESCRIPTION.md files for all three modules (resolves missing-readme pylint warnings)
• Generated README.rst files via OCA readme generator
• Added comprehensive test coverage files (test_coverage.py) for all three modules

New unit tests

• spp_metrics_core (25 total tests): Abstract model registry, field definitions/types/defaults, recursion detection (2-level, self-reference, 3-level cycle), category lifecycle (deactivate, reactivate, description, ordering)
• spp_metrics_services (115 total tests): Demographic dimension evaluation (field, expression, dot notation), label lookups, get_by_name/get_active_dimensions, cache invalidation on write/unlink, fairness analysis (boolean/many2one/selection/expression dimensions, disparity ratio), privacy service (k-anonymity, complementary suppression, access validation), distribution edge cases
• spp_aggregation (172 total tests): Access rule constraint validation (user/group exclusivity, k-anonymity bounds), scope allowed/dimensions allowed checks, cache key generation for all scope types, TTL and cron cleanup, scope resolver edge cases, aggregation service convenience methods

Unit tests executed by the author

All three modules pass cleanly:

• spp_metrics_core: 0 failed, 0 errors of 25 tests
• spp_metrics_services: 0 failed, 0 errors of 115 tests
• spp_aggregation: 0 failed, 0 errors of 172 tests

How to test manually

1. Install the three modules on a fresh Odoo 19 instance
2. Verify menus and views load without errors
3. Run tests via Docker to confirm all pass

Related links

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.39%. Comparing base (ae00c8a) to head (90939c5).
⚠️ Report is 9 commits behind head on 19.0.

Additional details and impacted files

@@            Coverage Diff             @@
##             19.0      #91      +/-   ##
==========================================
+ Coverage   69.91%   70.39%   +0.48%     
==========================================
  Files         674      674              
  Lines       37005    37005              
==========================================
+ Hits        25872    26051     +179     
+ Misses      11133    10954     -179     

Flag	Coverage Δ
spp_aggregation	85.06% <ø> (+5.01%)	⬆️
spp_api_v2_gis	71.52% <ø> (ø)
spp_api_v2_simulation	69.61% <ø> (ø)
spp_base_common	90.26% <ø> (ø)
spp_dci_demo	69.23% <ø> (ø)
spp_metrics_core	97.29% <ø> (+2.70%)	⬆️
spp_metrics_services	88.31% <ø> (+21.49%)	⬆️
spp_mis_demo_v2	69.82% <ø> (ø)
spp_programs	45.51% <ø> (ø)
spp_security	66.66% <ø> (ø)
spp_simulation	70.08% <ø> (ø)
spp_statistic	77.31% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
spp_aggregation/__manifest__.py	0.00% <ø> (ø)
spp_metrics_core/__manifest__.py	0.00% <ø> (ø)
spp_metrics_services/__manifest__.py	0.00% <ø> (ø)

... and 8 files with indirect coverage changes

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