fix: update legacy CDP wallet provider references in docs and generator

[yashhzd]

Description

Across the TypeScript and Python sides of the repo, a number of docs, the bug-report issue template, the Python contributing guide, and the generate-action-provider script still referenced wallet providers that were removed or renamed during the CDP Wallet API v2 migration:

• CdpWalletProvider (now CdpEvmWalletProvider)
• SmartWalletProvider / CDPSmartWalletProvider (now CdpSmartWalletProvider)
• CdpV2SolanaWalletProvider (now CdpSolanaWalletProvider)
• EthAccountWalletProvider (removed)
• PrivyEvmDelegatedWalletProvider (now PrivyEvmDelegatedEmbeddedWalletProvider)
• cdpWalletActionProvider (collapsed into walletActionProvider)

New users copying snippets from these docs hit import errors, config-shape mismatches (missing walletSecret / CDP_WALLET_SECRET), and an x402 example that imported from @coinbase/cdp-agentkit instead of @coinbase/agentkit. The generate-action-provider script was also offering these stale names as prompts, so scaffolding a new action provider with any of them produced code that imported symbols the package no longer exports.

This PR is scoped to bringing those references back in line with the current public surface. No runtime source under typescript/agentkit/src/ or coinbase_agentkit/ is modified.

What changed

fix(generate-action-provider)

• Replace the stale EVM_WALLET_PROVIDERS / SVM_WALLET_PROVIDERS entries in typescript/agentkit/scripts/generate-action-provider/constants.ts with the current exports (CdpEvmWalletProvider, CdpSmartWalletProvider, PrivyEvmDelegatedEmbeddedWalletProvider, ZeroDevWalletProvider, CdpSolanaWalletProvider).
• Add constants.test.ts, a regression test that imports * as walletProviders from "../../src/wallet-providers" and asserts every provider value surfaced by the generator is an actually-exported symbol. This fails loudly if wallet provider exports and the generator drift apart again.

docs

• Rewrite the wallet-provider sections of typescript/agentkit/README.md and python/coinbase-agentkit/README.md to use the current CdpEvm / CdpSmart / CdpSolana providers with their current apiKeySecret + walletSecret config surface. Drop the obsolete SmartWalletProvider and CDPSmartWalletProvider sections entirely.
• Add cdpWalletSecret / CDP_WALLET_SECRET to the default AgentKit.from(...) examples in the core TS README and in the LangChain, Model Context Protocol, and Vercel AI SDK framework-extension READMEs so the happy path actually runs.
• In python/framework-extensions/{autogen,langchain,openai-agents-sdk}/README.md, replace the removed CDP_API_KEY_PRIVATE env var with CDP_API_KEY_SECRET + CDP_WALLET_SECRET.
• Rewrite the action-provider walkthrough in CONTRIBUTING-PYTHON.md so it uses the canonical Erc721ActionProvider / EvmWalletProvider shape with a send_transaction + wait_for_transaction_receipt flow instead of the removed CdpWalletProvider.mint helper.
• Update .github/ISSUE_TEMPLATE/bug-report.yml to reproduce with CdpEvmWalletProvider + walletActionProvider, and correct the TypeScript snippet to use // comments instead of #.
• Fix the Compound action provider README test fixture (python/coinbase-agentkit/coinbase_agentkit/action_providers/compound/README.md) to construct CdpEvmWalletProvider(CdpEvmWalletProviderConfig()).
• Fix the Across action provider README to refer to CdpEvmWalletProvider, the x402 README to import from @coinbase/agentkit, and the generator-script README example to use CdpEvmWalletProvider.

Tests

• pnpm exec jest scripts/generate-action-provider/constants.test.ts in typescript/agentkit:

PASS scripts/generate-action-provider/constants.test.ts
  WALLET_PROVIDERS_BY_PROTOCOL
    ✓ only includes exported wallet providers

• pnpm exec eslint -c .eslintrc.json scripts/generate-action-provider/constants.ts scripts/generate-action-provider/constants.test.ts — clean.
• pnpm exec prettier -c .prettierrc --check on every touched .md and .ts file — all files use Prettier code style.
• pnpm exec tsc --noEmit in typescript/agentkit — no errors.

This PR does not change any action provider behavior or any runtime code paths exposed by the published packages, so there is no chatbot repro to attach. The generator-script change is covered by the new unit test, and the rest is documentation.

Checklist

• Added documentation to all relevant README.md files
• Added a changelog entry

No changeset / towncrier fragment is included: the changes are documentation plus a fix to typescript/agentkit/scripts/, which is not part of the published npm package (package.json files is ["dist"]), so none of the published artifacts change.

[cb-heimdall]

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