ref(integrations): Refactor platform detection to composable framework definitions

[jaydgoss]

Summary

• Refactor flat framework detection into composable FrameworkDef / DetectorRule system
• Add three signal types: path (config file existence), match_content (regex on file content), match_package (dependency lookup in parsed manifests)
• Add every (AND) and some (OR) rule composition
• Add priority ranking (sort field) and supersession (e.g. Next.js supersedes React)
• Refactor file content fetching into a single batch pass to minimize API calls

No behavior change for existing detections, but the architecture now supports easy addition of new frameworks as data-only entries.

Stack:

• PR 1: Core detection + API endpoint
• PR 2 (this): Composable framework definitions refactor
• PR 3: Expanded coverage (98% of picker platforms)

[linear]

VDY-15 POC: Platform detection from GitHub repository languages

[cursor]

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[github-actions]

Backend Test Failures

Failures on 8730df5 in this run:

tests/sentry/integrations/api/endpoints/test_organization_repository_platforms.py::OrganizationRepositoryPlatformsGetTest::test_detects_platforms — log

tests/sentry/integrations/api/endpoints/test_organization_repository_platforms.py:70: in test_detects_platforms
    assert response.data == {
E   AssertionError: assert {'platforms':...cript', ...}]} == {'platforms':...ython', ...}]}
E     
E     Differing items:
E     {'platforms': [{'bytes': 50000, 'confidence': 'medium', 'language': 'Python', 'platform': 'python', ...}, {'bytes': 30000, 'confidence': 'medium', 'language': 'JavaScript', 'platform': 'javascript', ...}]} != {'platforms': [{'bytes': 50000, 'confidence': 'medium', 'language': 'Python', 'platform': 'python', ...}]}
E     
E     Full diff:
E       {
E           'platforms': [
E               {
E                   'bytes': 50000,
E                   'confidence': 'medium',
E                   'language': 'Python',
E                   'platform': 'python',
E                   'priority': 1,
E               },
E     +         {
E     +             'bytes': 30000,
E     +             'confidence': 'medium',
E     +             'language': 'JavaScript',
E     +             'platform': 'javascript',
E     +             'priority': 1,
E     +         },
E           ],
E       }