[codex] Improve agent wallet docs

[blakecduncan]

What changed

• Rewrote the Agent Wallets page around concrete capabilities instead of high-level positioning.
• Removed the internal signer provider mention from the public docs.
• Added a capability matrix covering chains, operations, gas and fee sponsorship, session scopes, limits, and revocation behavior.
• Added end-to-end CLI examples for EVM and Solana Agent Wallet workflows.
• Added a machine-readable capability manifest for agents, skills, and system prompts.
• Updated the CLI docs to reflect current Agent Wallet session support for Solana sends and SPL token transfers.

Why

The previous Agent Wallets page underrepresented the product and did not give agents a precise way to discover wallet capabilities. The new page documents the actual CLI surface, Dashboard control plane, and machine-readable discovery path via agent-prompt --scope wallet.

Impact

Developers and AI agents get clearer guidance for connecting, verifying, using, sponsoring, and revoking Agent Wallet sessions. The page also avoids positioning Agent Wallets as a generic signing primitive and keeps current limitations explicit.

Validation

• pnpm exec prettier --check content/tutorials/build-with-ai/agent-wallets.mdx content/tutorials/build-with-ai/alchemy-cli.mdx
• pnpm exec eslint content/tutorials/build-with-ai/agent-wallets.mdx content/tutorials/build-with-ai/alchemy-cli.mdx
• git diff --check -- content/tutorials/build-with-ai/agent-wallets.mdx content/tutorials/build-with-ai/alchemy-cli.mdx

[github-actions]

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