feat: add SlateDB trace history example

[alongubkin]

Summary

• add a portable AI trace-history data plane using Storage, Queue, replicated API readers, and a single SlateDB writer
• add transactional indexes, durable acceptance, idempotent queue processing, pagination, and failure recording
• make local Storage report unsupported object attributes through the standard object-store error so SlateDB can fall back correctly
• include behavior tests and a deployed local end-to-end test

Verification

• cargo nextest run -p slatedb-trace-store
• cargo nextest run -p alien-bindings local_storage_rejects_object_attributes_without_writing_the_payload
• cargo clippy -p slatedb-trace-store --all-targets --locked --no-deps -- -D warnings
• pnpm exec tsc --noEmit
• pnpm test

Linear: ALIEN-584

[greptile-apps]

Greptile Summary

The PR adds a portable SlateDB-backed trace-history example with durable queue-based ingestion, indexed readers, failure recording, and local end-to-end coverage. It also updates local Storage to report unsupported object attributes using the standard object-store error.

• Adds API and single-writer container deployment definitions across AWS, GCP, Azure, and local development.
• Implements staged ingestion, transactional indexes, pagination, idempotent rejection records, and bounded queue-operation retries.
• Adds Rust behavior tests, a deployed TypeScript integration test, and workspace configuration.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
examples/slatedb-trace-store/src/service.rs	Implements durable ingestion and bounded queue retry behavior; the previously reported writer lifecycle and finalization-health behaviors are either corrected or explicitly documented as intentional.
examples/slatedb-trace-store/src/store.rs	Implements SlateDB trace persistence, transactional secondary indexes, and paginated reads without an accepted blocking finding.
examples/slatedb-trace-store/src/keys.rs	Defines primary, secondary-index, timestamp, and pagination-cursor encodings.
examples/slatedb-trace-store/alien.ts	Declares the storage, queue, replicated API, and singleton writer resources for the portable example.
crates/alien-bindings/src/providers/storage/local.rs	Returns the standard NotSupported object-store error for unsupported local object attributes, enabling SlateDB fallback behavior.
examples/slatedb-trace-store/tests/trace-store.test.ts	Exercises the deployed local ingestion and trace-query workflow.

Sequence Diagram

sequenceDiagram
    participant Client
    participant API
    participant Storage
    participant Queue
    participant Writer
    participant SlateDB
    Client->>API: POST /v1/traces
    API->>Storage: Store canonical staged trace
    API->>Queue: Enqueue ingestion pointer
    API-->>Client: 202 Accepted
    Writer->>Queue: Receive pointer
    Writer->>Storage: Read and validate staged trace
    Writer->>SlateDB: Commit trace and indexes
    Writer->>Queue: Acknowledge delivery
    Writer->>Storage: Delete staging object
    Client->>API: GET trace or indexed page
    API->>SlateDB: Read latest visible state
    API-->>Client: Trace response

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_{Reviews (14): Last reviewed commit: "fix: make rejection records idempotent" | Re-trigger Greptile}