fix(sdks): use JSONPath filter expressions in overlay + simplify Go SDK union types

[alexluong]

Summary

1. JSONPath filter expressions in pagination overlay

Replace brittle positional parameter indices with name-based filter expressions (e.g., parameters[?@.name == 'dir'] instead of parameters[2]). The indices broke when #732 added new query params which shifted all parameter positions.

Before (broken): direction override applied to next, next_cursor applied to time[gt], etc.
After (fixed): all overrides target the correct params by name, immune to reordering.

2. Go SDK: replace oneOf unions with plain arrays

Add a Go-specific Speakeasy overlay (go-array-params-overlay.yaml) that converts all oneOf: [string, array] query params to plain array types. This eliminates verbose tagged union constructors in the generated Go SDK. Affects 16 params across 8 endpoints.

A new Outpost API (Go) source is added to .speakeasy/workflow.yaml so the overlay only applies to Go — TS and Python are unaffected.

// Before — tagged union constructors
res, err := s.Events.List(ctx, operations.ListEventsRequest{
    TenantID: operations.CreateListEventsTenantIDArrayOfStr(
        []string{"tenant_123", "tenant_456"},
    ).Pointer(),
    Topic: operations.CreateListEventsTopicArrayOfStr(
        []string{"user.created", "user.updated"},
    ).Pointer(),
})

// After — plain slices
res, err := s.Events.List(ctx, operations.ListEventsRequest{
    TenantID: []string{"tenant_123", "tenant_456"},
    Topic:    []string{"user.created", "user.updated"},
})

Test plan

• speakeasy overlay validate passes for both overlays
• speakeasy overlay apply confirms oneOf removed, correct param targeting
• speakeasy run -t outpost-go — compiles, lints, tests pass
• TS/Python sources unchanged — no DX regression

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
outpost-docs	Ready	Preview, Comment	Mar 11, 2026 5:43pm
outpost-website	Ready	Preview, Comment	Mar 11, 2026 5:43pm