Audit pass: wire new orchestration-launch pages into sidebar; tidy stale terminology (#97)

Audit pass over the three PRs merged into hyc/orchestration-launch
(#83 Platform Credits, #87 Harnesses, #88 Agent identities) to
catch wiring and cross-reference issues before rollout.

Sidebar wiring (src/sidebar.ts):
- Under 'Oz Cloud Agents & Orchestration', add 'Agent identities'
  (slug agent-platform/cloud-agents/agents) after Managing cloud
  agents, and a new collapsed 'Harnesses' subsection (Overview,
  Warp Agent, Claude Code, Codex, Authentication) after Secrets and
  before MCP servers.
- Under 'Plans and billing', add 'Platform credits' after Add-on
  Credits.

Terminology / cross-reference (one-line tweaks):
- external-authentication-required.mdx:104: replace the inline
  '(service account)' parenthetical with 'bound to an [agent
  identity](...)'. Matches the alias formalized in agents.mdx and
  the existing phrasing in federate.mdx and cli/index.mdx.
- cloud-agents/overview.mdx Learn more: add two bullets so the new
  Harnesses overview and Agent identities pages are discoverable
  from the parent overview.

Validation:
- check_links --internal-only: 0 broken across 2,495 internal links
  (up 3 from the 2,492 baseline, matching the 3 new links added).
- style_lint --changed: 14 warnings, identical to baseline (all
  pre-existing proper-name false positives in pricing-faqs.mdx,
  bring-your-own-api-key.mdx, etc.).
- npm run build: succeeds; 326 HTML files generated.

Co-authored-by: Oz <oz-agent@warp.dev>

Author: hongyi-chen

src/content/docs/agent-platform/cloud-agents/overview.mdx

@@ -144,6 +144,8 @@ If your credit balance reaches zero, cloud agent runs will not be able to execut
 
 * [Cloud agents quickstart](/agent-platform/cloud-agents/quickstart/) — run your first cloud agent with an environment in ~10 minutes.
 * [Oz Platform](/agent-platform/cloud-agents/platform/) — CLI, Oz API/SDK, orchestration, tasks, environments, hosts, integrations, and more.
+* [Harnesses](/agent-platform/cloud-agents/harnesses/) — pick between Warp Agent, Claude Code, and Codex for any cloud agent run.
+* [Agent identities](/agent-platform/cloud-agents/agents/) — team-scoped bot accounts that own and execute cloud agent runs.
 * [Skills as Agents](/agent-platform/cloud-agents/skills-as-agents/) — run agents based on reusable skill definitions from the CLI, web app, API, or on a schedule.
 * [Oz CLI](/reference/cli/) — shows how to run Oz agents in non-interactive mode from CI, scripts, or remote machines, including auth and common commands.
 * [Environments](/agent-platform/cloud-agents/environments/) — explains how environments provide the runtime context (repo, image, startup commands) for agent tasks.

src/content/docs/reference/api-and-sdk/troubleshooting/errors/external-authentication-required.mdx

@@ -101,7 +101,7 @@ This error includes extra fields beyond the standard response format:
 2. Ensure the app has access to all repositories listed in `inaccessible_repos`.
 3. Retry the task.
 
-If you are using a **team API key** (service account), ensure the Warp GitHub App is installed on the organization that owns the repositories.
+If you are using a **team API key** bound to an [agent identity](/agent-platform/cloud-agents/agents/), ensure the Warp GitHub App is installed on the organization that owns the repositories.
 
 ### Account matching failed
 

src/sidebar.ts

@@ -351,10 +351,22 @@ export const sidebarTopics: StarlightSidebarTopicsUserConfig = [
 						},
 						'agent-platform/cloud-agents/environments',
 						{ slug: 'agent-platform/cloud-agents/managing-cloud-agents', label: 'Managing cloud agents' },
+						{ slug: 'agent-platform/cloud-agents/agents', label: 'Agent identities' },
 						{ slug: 'agent-platform/cloud-agents/oz-web-app', label: 'Oz web app' },
 						{ slug: 'agent-platform/cloud-agents/skills-as-agents', label: 'Skills as agents' },
 						{ slug: 'agent-platform/cloud-agents/viewing-cloud-agent-runs', label: 'Viewing cloud agent runs' },
 						'agent-platform/cloud-agents/secrets',
+						{
+							label: 'Harnesses',
+							collapsed: true,
+							items: [
+								{ slug: 'agent-platform/cloud-agents/harnesses', label: 'Overview' },
+								{ slug: 'agent-platform/cloud-agents/harnesses/warp-agent', label: 'Warp Agent' },
+								{ slug: 'agent-platform/cloud-agents/harnesses/claude-code', label: 'Claude Code' },
+								{ slug: 'agent-platform/cloud-agents/harnesses/codex', label: 'Codex' },
+								{ slug: 'agent-platform/cloud-agents/harnesses/authentication', label: 'Authentication' },
+							],
+						},
 						{ slug: 'agent-platform/cloud-agents/mcp', label: 'MCP servers' },
 						{ slug: 'agent-platform/cloud-agents/deployment-patterns', label: 'Deployment patterns' },
 						{ slug: 'agent-platform/cloud-agents/warp-hosting', label: 'Warp-hosted agents' },
@@ -502,6 +514,7 @@ export const sidebarTopics: StarlightSidebarTopicsUserConfig = [
 						{ slug: 'support-and-community/plans-and-billing/plans-pricing-refunds', label: 'Plans, Pricing, & Refunds' },
 						'support-and-community/plans-and-billing/credits',
 						'support-and-community/plans-and-billing/add-on-credits',
+						{ slug: 'support-and-community/plans-and-billing/platform-credits', label: 'Platform credits' },
 						'support-and-community/plans-and-billing/bring-your-own-api-key',
 						'support-and-community/plans-and-billing/overages-legacy',
 						'support-and-community/plans-and-billing/pricing-faqs',