fix(v/25.2): align playbook with streaming component (finish #1703 rename)

[Feediver1]

What

Aligns local-antora-playbook.yml on v/25.2 with the component names actually published today, finishing two half-applied per-branch renames.

Setting	Before	After	Severity
site.start_page	25.2@ROOT:get-started:intro-to-events.adoc	25.2@streaming:...	Fatal (deploy fails)
archive-attachments source	component: 'ROOT'	component: 'streaming'	latent
replace-attributes components	- 'ROOT'	- 'streaming'	latent
generate-index-data docker_labs	component: redpanda-labs	component: labs	latent
replace-attributes components	- 'redpanda-labs'	- 'labs'	latent

Why

Two component renames were applied to v/25.2's antora.yml / content sources over time but never reflected in the playbook:

1. ROOT → streaming (PR Rename ROOT to streaming component (v25.2) #1703, 2026-05-26): antora.yml became name: streaming, but the playbook still pointed at ROOT. site.start_page aimed at the now-nonexistent ROOT component, so Antora can't resolve the site start page and the Netlify deploy preview fails. This has broken every v/25.2 PR deploy since 2026-05-26; later PRs (DOC-2237: correct decommission + maintenance mode guidance (v/25.2 backport) #1737, Update setup scripts domain to pull Redpanda packages from the new Artifact Registry #1752) merged anyway because the preview isn't a required check. It's currently blocking David Yu's backports [v/25.2] manage/k8s: document decommission timing (--decommission-wait-interval) #1765 and [v/25.2] manage: document rpk OAUTHBEARER (OIDC) for Kafka/Admin/SR APIs #1767, neither of which touches the playbook.

2. redpanda-labs → labs: the redpanda-labs repo publishes its component as name: labs (docs/antora.yml), and main's playbook already uses labs. v/25.2 still referenced redpanda-labs in two labs-extension configs. Non-fatal — the configs just match no component, so the docker-labs index attribute and labs attachment replacements silently no-op on v/25.2 — but a real correctness gap.

The content-source repo URL (github.com/redpanda-data/redpanda-labs) is unchanged: that's the repo name, not the component name.

Testing

• Netlify preview builds clean. Because v/25.2 has a backlog of merged-but-never-cleanly-built PRs, don't trust a green SUCCESS alone — grep the deploy log for ERROR (asciidoctor) to confirm no remaining build errors surface once the start page resolves.

🤖 Generated with Claude Code

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[micheleRP]

Review — LGTM

Correct build-infra fix; verified both renames against the live component names:

• ROOT → streaming (fatal): v/25.2 `antora.yml` is `name: streaming` (renamed in #1703), so the old `start_page: 25.2@ROOT:...` pointed at a nonexistent component and failed the Antora/Netlify build. The new target `25.2@streaming:get-started:intro-to-events.adoc` resolves (page exists on the branch). The `archive-attachments` source and `replace-attributes` component list are corrected to match.
• redpanda-labs → labs (latent): the live `redpanda-data/redpanda-labs` `docs/antora.yml` publishes `name: labs`, and `main` + the production `docs-site` playbook already use `labs`. The v/25.2 `redpanda-labs` references matched no component and silently no-op'd; aligning to `labs` is correct. The content-source URL (`github.com/redpanda-data/redpanda-labs`) is rightly left unchanged.
• All 5 edits match the PR table; no stale `ROOT` component references remain.

Agree with the testing note: since v/25.2 has a backlog of merged-but-never-cleanly-built PRs, confirm by grepping the deploy log for `ERROR (asciidoctor)` rather than trusting a green SUCCESS.