docs: clarify that trade accepts bare tickers, not just addresses

[psmiratisu]

What

acp trade never resolves tokens locally — it forwards --token-in/--token-out to the /trade/plan backend (internal-trading-bot), whose resolver handles bare tickers for directional trades:

• buy (a dollar/canonical/address --token-in → --token-out <TICKER>) → the deployment with the highest 24h volume (filters same-ticker scams)
• sell (--token-in <TICKER> → a dollar --token-out) → the wallet's actual holdings

The old line — "Known token symbols … anything else is treated as a token address" — was stale: it only holds for a token→token swap with no dollar leg (there a non-canonical bare symbol is rejected as AMBIGUOUS_SYMBOL and needs an address). As written it pushed users and CLI-driving agents to pre-resolve a contract address they don't need.

Changes

• SKILL.md (swap section) and README.md (Trading section): replace the "treated as a token address" line with the accurate rule — a bare ticker resolves for buys/sells; an explicit address is only required for a token→token swap.

Docs only — no code or CLI behavior change. The backend already behaves this way; verified against internal-trading-bot POST /api/trade/plan → resolveFlatTrade → resolveByTicker (buy = highest 24h volume, sell = wallet holdings).

Note

Recommend a quick testnet smoke-test before merge (a small buy-by-ticker, e.g. acp trade --token-in usdc --chain-in 8453 --amount-in 2 --token-out <TICKER> --chain-out 8453 --json) to confirm the wording matches the deployed backend for a direct CLI user.

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Note

Low Risk
Documentation-only edits to README and SKILL; no code, APIs, or trading logic changed.

Overview
Docs-only update to README.md and SKILL.md so swap guidance matches how acp trade actually works with the /trade/plan backend.

The old wording implied non-canonical symbols are always treated as contract addresses. The new text says canonical symbols still resolve locally, but directional buys and sells can pass a bare ticker and the backend picks the token (buy: highest 24h volume; sell: wallet holdings). Token→token swaps without a dollar leg still need an explicit address; bare tickers there stay ambiguous (AMBIGUOUS_SYMBOL).

No CLI or runtime behavior changes.

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