chore: add planner watermarks to all AGENTS.md files

AGENTS.md

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 # Agent Brief: Harb Stack
 
 ## What is KRAIKEN?

kraiken-lib/AGENTS.md

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 # Kraiken Library - Agent Guide
 
 Shared TypeScript helpers used by the landing app, txnBot, and other services to talk to KRAIKEN contracts and the Ponder GraphQL API.

landing/AGENTS.md

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 # Landing Interface - Agent Guide
 
 Vue 3 + Vite application that delivers the public marketing site and forthcoming staking UI.

onchain/AGENTS.md

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 # Agent Brief: Kraiken Protocol
 
 ## Protocol Philosophy & Business Logic

services/ponder/AGENTS.md

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 # Ponder Indexer - Agent Guide
 
 Ponder-based indexer that records Kraiken protocol activity and exposes the GraphQL API consumed by the app and automation bot.

services/txnBot/AGENTS.md

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 # Transaction Bot - Agent Guide
 
 Automation service that maintains liquidity alignment and tax enforcement for the KRAIKEN protocol.

web-app/AGENTS.md

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 # Web App - Agent Guide
 
 Vue 3 + TypeScript staking interface for KRAIKEN, enabling users to stake tokens, manage positions, and interact with Harberger-tax mechanics.