Add Redis Cloud Agent Memory REST quickstart

[n-valchev]

Summary

• Add a runnable Redis Cloud Agent Memory REST quickstart covering session events, session retrieval, long-term memory creation, and memory search.
• Connect the service creation and service details pages to the new workflow.
• Align the Agent Memory developer landing page, developer guide, and API examples with the quickstart.

Testing

• Full Hugo site build with garbage collection and debug logging
• Shell syntax validation for the runnable examples
• JSON request-body validation with jq
• Independent technical accuracy review against the Smithy API definitions and integration tests

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Note

Low Risk
Documentation-only changes with no application code, APIs, or infrastructure impact.

Overview
Redis Cloud Agent Memory REST quickstart replaces the thin use-agent-memory page with an end-to-end guide: prerequisites, service creation, shell exports (AGENT_MEMORY_URL, STORE_ID, API_KEY), and runnable curl flows for session events, session retrieval, direct long-term memory creation, and semantic search—including notes on async extraction and one-time API keys.

Doc navigation is retargeted so Agent Memory on Redis Cloud starts at that quickstart: landing cards on _index and developer-guide, the Redis Cloud get-started embed, and “next steps” on create/view service pages now say “continue with the REST quickstart” instead of generic API usage links.

Develop docs are slimmed so they complement the quickstart: api-examples drops the sample auth curl and defers env vars to the quickstart; JSON examples lose redundant POST line prefixes; developer-guide removes inline API quick-start JSON and short auth curl in favor of links to the quickstart, API examples, and reference.

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[github-actions]

Staging links:
https://redis.io/docs/staging/docs/agent-memory-rest-quickstart/develop/ai/context-engine/agent-memory/
https://redis.io/docs/staging/docs/agent-memory-rest-quickstart/operate/rc/context-engine/agent-memory/
https://redis.io/docs/staging/docs/content/develop/ai/context-engine/agent-memory/
https://redis.io/docs/staging/docs/content/develop/ai/context-engine/agent-memory/api-examples/
https://redis.io/docs/staging/docs/content/develop/ai/context-engine/agent-memory/developer-guide/
https://redis.io/docs/staging/docs/content/operate/rc/context-engine/agent-memory/create-service/
https://redis.io/docs/staging/docs/content/operate/rc/context-engine/agent-memory/use-agent-memory/
https://redis.io/docs/staging/docs/content/operate/rc/context-engine/agent-memory/view-service/