ci(profiles): W4 add coverage for 9 orphan extensions + mlops

[ulises-jeremias]

Description

Fixes orphan extension coverage (W4-1, §3). 9/18 extensions had no L3 profile (cors, redis, sqlalchemy, otel, rate-limit, mlflow-tracing, rag-pgvector, django-spectacular, pre-commit). Adds 4 curated profiles covering 100% of extensions plus mlops-sklearn template (PR #179).

Changes

• ci/profiles/fastapi-observability.json — fastapi-starter + github-setup + fastapi-cors (security) + fastapi-sqlalchemy (database) + fastapi-opentelemetry (observability) + fastapi-rag-pgvector (ai-ml) — 5 distinct categories, all fastapi-backend compatible
• ci/profiles/fastapi-data.json — fastapi-starter + pre-commit (ci) + fastapi-redis (database) + fastapi-rate-limit (security) + fastapi-mlflow-tracing (observability) — respects one-per-category, covers remaining fastapi orphans and pre-commit (cannot co-locate github-setup + pre-commit — same ci category)
• ci/profiles/django-full.json — django-api + github-setup + development-container + django-docker + postgres + django-spectacular — covers django-spectacular orphan (observability, django-backend only)
• ci/profiles/mlops-sklearn-default.json — mlops-sklearn-starter + github-setup — cherry-picked from PR ci: add mlops-sklearn-starter profile and github-setup support (fixes #92) #179 (8e581e6); will be deduplicated when ci: add mlops-sklearn-starter profile and github-setup support (fixes #92) #179 merges. Note: task suggested all-github-setup + all-pre-commit but they share ci category — invalid per assert_profile_valid (category uniqueness). pre-commit orphan is already covered via fastapi-data.
• templates.json — add mlops-sklearn to github-setup type array for L2/L3 coverage (as per ci: add mlops-sklearn-starter profile and github-setup support (fixes #92) #179)

Category / Type Validation

Each profile validated via assert_profile_valid:

• No duplicate category per profile
• Each addon type includes the template's type
• incompatibleWith respected (none currently on main; fastapi-opentelemetry vs fastapi-mlflow-tracing are kept in separate profiles to remain compatible if ci: add mlops-sklearn-starter profile and github-setup support (fixes #92) #179's incompatibleWith lands)

How Has This Been Tested?

• python scripts/ci/validate-registry.py — ✅ registry ok (6 templates, 18 extensions)
• python scripts/ci/generate-matrix.py --layer validate-profiles — ✅ 13 profiles validated (9 → 13)
• Orphan check: 0 orphans (was 9) — covered = 18/18
• python scripts/ci/generate-matrix.py --layer profiles — generates valid L3 matrix

Type of Change

• CI / tooling

Checklist

• url points to correct path on main
• slug globally unique
• All required fields present
• Extension type is array where multi-type

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📥 Commits

Reviewing files that changed from the base of the PR and between 1e8f5d0 and 6115362.

📒 Files selected for processing (5)

• ci/profiles/django-full.json
• ci/profiles/fastapi-data.json
• ci/profiles/fastapi-observability.json
• ci/profiles/mlops-sklearn-default.json
• templates.json

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