feat(integrations): add sentry Stripe catalog provider

[snowmead]

Summary

• Adds the sentry Stripe Projects catalog integration family as CatalogResource adapter(s).
• Follows docs/ADDING-A-PROVIDER.md and docs/PROVIDER-WAVES.md.
• Includes gap test + hermetic provision test. OUTPUT_FIELDS provisional until mise run discover.

Test plan

• Gap + hermetic tests in module
• Live mise run discover when provider is linked
• Merge after resolving additive registry.rs conflict with other family PRs

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Note

Low Risk
Additive integrations and shared config helpers with offline tests; credential output names are provisional until discover, which could cause live provision mismatches if wrong.

Overview
Adds Sentry as a Phase 1 Stripe Projects catalog family with two managed integrations: sentry/project (provider = "sentry", outputs dsn, optional platform / project_name) and sentry/seer (provider = "sentry-seer", output auth_token, empty config). Both follow the standard CatalogResource pattern with gap tests, hermetic provision_script tests, and provisional OUTPUT_FIELDS until mise run discover.

Wires them into register_providers!, pub mod sentry, and extends the assert_outputs_match drift test for both types.

Extends stackless-provider-sdk config helpers with int_optional, bool_required, and bool_optional (for upcoming catalog schemas and the new codegen).

Documents catalog-first rollout and parallel provider waves in DECISIONS.md, PROVIDER-WAVES.md, and a pointer in ADDING-A-PROVIDER.md. Adds scripts/generate_catalog_integrations.py to scaffold future deployables (Sentry listed in IMPLEMENTED / OUTPUT_HINTS; script does not rewrite registry/mod).

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[snowmead]

Landed on main via local merge + union-sort (#56).