docs: rename Rules Engine 2.0 to Triage Engine

[Maffooch]

[sc-15524]

Description

Renames the automation docs section from Rules Engine 2.0 to Triage Engine, to match the product name change. The name was already adopted in a few peripheral pages (the sidebar redesign mapping, menu badges, remediation SLAs); this completes the rename in the section that actually documents the feature, across English and all seven translations.

What changed

• Move content/automation/rules_engine_2/ → content/automation/triage_engine/ (the URL becomes /automation/triage_engine/). Each page keeps an aliases: entry for the old /automation/rules_engine_2/ path (and the still-older rules_engine_v2 path), so existing links keep resolving. Verified with a local Hugo build: the new pages render and the old URLs redirect.
• Swap the display name in titles and prose across all 8 languages.
• Update cross-references from the classic Rules Engine page, messaging connectors, PAIN ratings, audit log index, permission chart, page layouts and risk acceptance docs. The changelog and the sidebar redesign mapping table keep the historical name on purpose.
• Node reference: document three nodes that were missing (Assign to a Dedupe Pool, Publish to an SNS Topic, Set Potential Agency Impact) and correct the node count to 41.

Notes

• The two DAST-related nodes are documented separately with the Sensei Dynamic Scanning feature, not in this node reference.
• The node-reference translations are independently behind the English source (they predate several nodes); that is a pre-existing translation-pipeline gap and is out of scope for this rename.

Paired with the corresponding Pro UI label rename, on the same release line.