fix(sp): fetch only the Savings Plan types requested by --include/--exclude-sp-types

[cristim]

Closes #2177

Root cause

parseServices expands savingsplans into four per-type slugs. Each slug sets RecommendationParams.Service to one plan type, and the library's planTypesForParams returns that single type as soon as the service is a per-type slug, so IncludeSPTypes/ExcludeSPTypes (cmd/multi_service_helpers.go fetchRecommendationsForRegion) are never consulted. The fix narrows the SP service list in determineServicesToProcess (new filterSavingsPlanTypes), so only requested types are fetched. Names match case-insensitively; an unknown name is an error rather than silently ignored. Non-SP services are untouched. No library change.

Evidence

Regression test TestDetermineServicesToProcess_SavingsPlanTypeFilters.

• Before (source change stashed): FAIL on include/exclude cases (all four types returned) and on the unknown-name case (no error).
• After: PASS. Full go test ./... passes (1358); go vet clean. make lint cannot run locally (golangci-lint built with older Go than go.mod); CI is authoritative.

Real data, dry run only, --services savingsplans --include-sp-types EC2Instance ...: main prints Processing services: Compute, EC2 Instance, SageMaker, Database Savings Plans; this branch prints Processing services: EC2 Instance Savings Plans and queries only that type. (Recommendations themselves need #2176, which is a separate PR.)

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📥 Commits

Reviewing files that changed from the base of the PR and between 00d82c3 and df5f97b.

📒 Files selected for processing (2)

• cmd/multi_service_helpers.go
• cmd/multi_service_helpers_test.go

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[cristim]

Independent review (claude-opus-5-5) of df5f97b: APPROVE

Root cause (confirmed against the pinned library)

providers/aws@v0.0.0-20261012195142-218912bb8cb9, recommendations/parser_sp.go:268-272: planTypesForParams returns a single plan type for any of the four per-type slugs and only falls back to getFilteredPlanTypes(IncludeSPTypes, ExcludeSPTypes) for other slugs. cmd/main.go parseServices expands savingsplans into the four per-type slugs, so the include/exclude lists were never read. Filtering the service list in determineServicesToProcess is the right layer.

Findings (none blocking)

• Empty result after filtering (for example --include-sp-types Compute --exclude-sp-types Compute, or --services savingsplans-compute --include-sp-types EC2Instance) exits 1 with the generic No valid services specified. Fails loud, but the message does not name the SP filters. Optional follow-up.
• Behaviour change: an unknown SP type name now exits 1 (previously silently ignored), including when no SP service is selected. Consistent with fail-loud; docs/cli/filtering.md could mention it.
• --input-csv mode does not go through determineServicesToProcess, so the SP type filters do not apply there. Pre-existing, out of scope.
• spTypeWanted is a single-caller helper; acceptable (keeps the loop flat for gocyclo).
• The base is 00d82c3; main has since gained fix(sp): stop filtering Savings Plan recommendations on the endpoint region #2182 (0a28aa4), which touches the same file in a different hunk. git merge-tree is clean.

Local verification (macOS, exact head)

• go vet ./...: clean. go test ./...: 1358 passed, 0 failed.
• Fail-before: new test kept, cmd/multi_service_helpers.go reverted to the parent. TestDetermineServicesToProcess_SavingsPlanTypeFilters: 5 of 6 subtests FAIL (include, exclude, include-then-exclude, non-SP untouched, unknown fails loud); only "no filter keeps all four" passes. Example: expected: [savings-plans-ec2instance], actual: [savings-plans-compute savings-plans-ec2instance savings-plans-sagemaker savings-plans-database].
• Mutation 1 (include set short-circuits, exclude ignored): include_then_exclude FAILS (actual: [compute ec2instance]). Mutation 2 (drop strings.ToLower): include_narrows,_case-insensitive and exclude_drops FAIL.
• Real dry runs against the shift-prd account (SSO creds exported to env, so --profile omitted), --services savingsplans --term 1 --payment no-upfront --rec-lookback-period 30d --coverage 100 --regions us-east-1, no --purchase/--yes:
  • head --include-sp-types EC2Instance: Processing services: EC2 Instance Savings Plans, one fetch line Fetching EC2 Instance Savings Plans recommendations.
  • head --exclude-sp-types Compute,SageMaker: Processing services: EC2 Instance Savings Plans, Database Savings Plans, two fetch lines (EC2 Instance, Database).
  • head --include-sp-types "compute, database": Compute and Database fetched.
  • head --include-sp-types bogus: exit 1, Invalid services: unknown Savings Plan type "bogus" in --include-sp-types; valid types: Compute, EC2Instance, SageMaker, Database.
  • parent --include-sp-types EC2Instance and parent --include-sp-types bogus: all four types fetched (Compute, EC2 Instance, SageMaker, Database), exit 0.
• Coverage gap: the account returned 0 SP recommendations for every type in this window, so the runs prove which plan types are queried, not the content of returned recommendations.

CI is green on this SHA and the PR is mergeable.