DEV: ROS8.8 release docs

[dwdougherty]

Redis 8.8 release docs

Reviewer(s): all the individual commits to this 8.8 feature branch have been reviewed by PM and peers. As such, all that's needed is a final approving nod from somebody on the docs team.

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Note

Low Risk
Documentation-only changes with no application runtime logic; risk is limited to doc accuracy and discoverability of preview Array APIs.

Overview
This PR adds Redis Open Source 8.8 reference documentation: new commands, command updates, and site wiring for the Array command group.

Array (preview) — A new Array commands section documents the preview string-array type (ARSET, ARGET, ARMSET, ARMGET, ARLEN, ARCOUNT, ARDEL, ARDELRANGE, ARGETRANGE, ARSCAN, ARGREP, AROP, ARINSERT, ARNEXT, ARSEEK, ARRING, ARLASTITEMS, ARINFO, etc.), marked as subject to change. build/generate_version_commands_page.py registers the array group in the commands catalog.

New / extended commands — INCREX (atomic increment with bounds, SATURATE, and TTL/ENX). ACL LOAD documents # comment lines (stripped on load/save; not persisted). JSON.SET adds optional FPHA (FP16 / BF16 / FP32 / FP64) for floating-point homogeneous arrays.

Observability — INFO expands stats (slowlog aggregates, parse-batch / client-processing metrics) and commandstats slowlog fields. CLIENT LIST adds read-events, parse-batch-cmd-sum, and parse-batch-cnt (8.8).

Search — FT.AGGREGATE documents REDUCE COLLECT (8.8) with an example; metadata/syntax for reducers and APPLY/FILTER is expanded. FT.PROFILE includes HYBRID. FT.HYBRID documents SHARD_K_RATIO on KNN. Several search command pages link to Search commands in MULTI/EXEC transactions and Lua scripts.

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[github-actions]

DOC-6334

[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-6334/commands/acl-load/
https://redis.io/docs/staging/DOC-6334/commands/arcount/
https://redis.io/docs/staging/DOC-6334/commands/ardel/
https://redis.io/docs/staging/DOC-6334/commands/ardelrange/
https://redis.io/docs/staging/DOC-6334/commands/arget/
https://redis.io/docs/staging/DOC-6334/commands/argetrange/
https://redis.io/docs/staging/DOC-6334/commands/argrep/
https://redis.io/docs/staging/DOC-6334/commands/arinfo/
https://redis.io/docs/staging/DOC-6334/commands/arinsert/
https://redis.io/docs/staging/DOC-6334/commands/arlastitems/
https://redis.io/docs/staging/DOC-6334/commands/arlen/
https://redis.io/docs/staging/DOC-6334/commands/armget/
https://redis.io/docs/staging/DOC-6334/commands/armset/
https://redis.io/docs/staging/DOC-6334/commands/arnext/
https://redis.io/docs/staging/DOC-6334/commands/arop/
https://redis.io/docs/staging/DOC-6334/commands/arring/
https://redis.io/docs/staging/DOC-6334/commands/arscan/
https://redis.io/docs/staging/DOC-6334/commands/arseek/
https://redis.io/docs/staging/DOC-6334/commands/arset/
https://redis.io/docs/staging/DOC-6334/commands/client-list/
https://redis.io/docs/staging/DOC-6334/commands/ft.aggregate/
https://redis.io/docs/staging/DOC-6334/commands/ft.cursor-read/
https://redis.io/docs/staging/DOC-6334/commands/ft.hybrid/
https://redis.io/docs/staging/DOC-6334/commands/ft.profile/
https://redis.io/docs/staging/DOC-6334/commands/ft.search/
https://redis.io/docs/staging/DOC-6334/commands/increx/
https://redis.io/docs/staging/DOC-6334/commands/info/
https://redis.io/docs/staging/DOC-6334/commands/json.set/
https://redis.io/docs/staging/DOC-6334/commands/redis-8-8-commands/

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[dwdougherty]

Thank you for approving, @andy-stark-redis!

[rrelledge]

The RS compatibility page looks good to me aside from some of the command links.