docs: update Perplexity adapter pages to ToolAdapter (D-13)

Class 4B paired docs commit for SR-003 (loop-engine
`6843194`). Updates the five MDX pages that referenced the
`LLMAdapter` interface to instead reference `ToolAdapter`,
matching the post-rename source state in
`@loop-engine/core`. The five pages:

- `content/docs/integrations/index.mdx`
- `content/docs/changelog.mdx` (Unreleased section only;
  becomes the 1.0.0-rc.0 entry)
- `content/docs/ai-and-automation/ai-as-actor.mdx` (two
  references)
- `content/docs/integrations/perplexity.mdx`
- `content/docs/packages/adapter-perplexity.mdx`

The four other AI provider pages (Anthropic / OpenAI / Gemini /
Grok) are untouched here. Their re-homing onto `ActorAdapter`
is a separate Phase A.3 work item (D-13 secondary; not part of
SR-003's narrow scope).

Verification: `npx tsc --noEmit` green; `pnpm lint` green;
`pnpm build` green (12+ routes prerendered, no MDX parse
errors).

Surface-Reconciliation-Id: SR-003

Author: betterdataco

content/docs/ai-and-automation/ai-as-actor.mdx

@@ -112,9 +112,9 @@ The full dual-provider walkthrough is in `/docs/examples/ai-replenishment`, with
 | [`@loop-engine/adapter-openai`](/docs/packages/adapter-openai) | OpenAI (`gpt-4o`, o-series) |
 | [`@loop-engine/adapter-grok`](/docs/packages/adapter-grok) | Grok (`grok-3`, `grok-2`) via xAI |
 | [`@loop-engine/adapter-gemini`](/docs/packages/adapter-gemini) | Gemini (`gemini-1.5-pro`, `gemini-2.0-flash`) |
-| [`@loop-engine/adapter-perplexity`](/docs/packages/adapter-perplexity) | Perplexity Sonar (`sonar`, `sonar-pro`, …) — `LLMAdapter` with citations for research steps |
+| [`@loop-engine/adapter-perplexity`](/docs/packages/adapter-perplexity) | Perplexity Sonar (`sonar`, `sonar-pro`, …) — `ToolAdapter` with citations for research steps |
 
-The Perplexity package implements `LLMAdapter.invoke()` (text + citations), not the actor `createSubmission` flow. Use it where you need grounded retrieval inside a loop; use the actor adapters above for structured signal decisions.
+The Perplexity package implements `ToolAdapter.invoke()` (text + citations), not the actor `createSubmission` flow. Use it where you need grounded retrieval inside a loop; use the actor adapters above for structured signal decisions.
 
 ## Related
 

content/docs/changelog.mdx

@@ -14,8 +14,8 @@ Versioning: [Semantic Versioning](https://semver.org/)
 ## Unreleased
 
 ### Added
-- `@loop-engine/adapter-perplexity` — Perplexity Sonar `LLMAdapter` with citations, retries, and `guardEvidence` integration
-- `@loop-engine/core` — `LLMAdapter`, `AdapterInput` / `AdapterOutput`, and deep `guardEvidence()` for adapter audit redaction
+- `@loop-engine/adapter-perplexity` — Perplexity Sonar `ToolAdapter` with citations, retries, and `guardEvidence` integration
+- `@loop-engine/core` — `ToolAdapter`, `AdapterInput` / `AdapterOutput`, and deep `guardEvidence()` for adapter audit redaction
 - Docs: `docs/integrations-perplexity.md` (Sonar vs [Perplexity Computer skills](https://www.perplexity.ai/computer/skills))
 - Release contract stub: `.rc/adapter-perplexity.json` (RC **DRAFT** until promoted **LOCKED**)
 

content/docs/integrations/index.mdx

@@ -8,7 +8,7 @@ Connect Loop Engine to any AI provider, agentic platform, storage backend, or ob
 
 ## ⟩ AI Providers
 
-Use any major LLM as a governed actor. Provider actor adapters produce the same `AIAgentActor` shape — switching providers requires changing one import. Perplexity Sonar covers **grounded retrieval with citations** as an `LLMAdapter` for research steps (see the package reference).
+Use any major LLM as a governed actor. Provider actor adapters produce the same `AIAgentActor` shape — switching providers requires changing one import. Perplexity Sonar covers **grounded retrieval with citations** as a `ToolAdapter` for research steps (see the package reference).
 
 <div className="grid gap-4 md:grid-cols-2">
   <IntegrationCard

content/docs/integrations/perplexity.mdx

@@ -18,7 +18,7 @@ section: Integrations
 
 ## What it does
 
-`@loop-engine/adapter-perplexity` implements `LLMAdapter.invoke()` against the Sonar chat API. You get answer text plus structured citations for audit and evidence attachment. Use it where provenance matters more than open-ended generation.
+`@loop-engine/adapter-perplexity` implements `ToolAdapter.invoke()` against the Sonar chat API. You get answer text plus structured citations for audit and evidence attachment. Use it where provenance matters more than open-ended generation.
 
 ## When to use it
 

content/docs/packages/adapter-perplexity.mdx

@@ -10,7 +10,7 @@ section: "packages"
 
 ## Overview
 
-`@loop-engine/adapter-perplexity` wraps the Perplexity Sonar chat API as a Loop Engine `LLMAdapter`. Sonar adds grounded web retrieval with cited sources. You use it for Loop steps that need real-time, verifiable information — regulatory lookups, compliance research, supplier or market news. It is not a general-purpose generation adapter; for broad LLM actor flows, use [Anthropic](/docs/packages/adapter-anthropic) or [OpenAI](/docs/packages/adapter-openai) actor adapters.
+`@loop-engine/adapter-perplexity` wraps the Perplexity Sonar chat API as a Loop Engine `ToolAdapter`. Sonar adds grounded web retrieval with cited sources. You use it for Loop steps that need real-time, verifiable information — regulatory lookups, compliance research, supplier or market news. It is not a general-purpose generation adapter; for broad LLM actor flows, use [Anthropic](/docs/packages/adapter-anthropic) or [OpenAI](/docs/packages/adapter-openai) actor adapters.
 
 ## Installation