[RobMartello]

Description

Adds the **Tereno** Action Provider (`@coinbase/agentkit`), enabling autonomous
agents on Base to perform sub-second, pre-action verification, smart contract risk
auditing, token metadata inspection, and prediction market evidence retrieval over
x402 micropayments.

### Capabilities Included:
- `tereno_check_contract`: Pre-action contract verification (verdict: `allow` /
`review` / `block`, bytecode integrity, EIP-1967 proxy implementation changes, and
pause status).
- `tereno_get_token_metadata`: Block-fresh ERC-20 token metadata (name, symbol,
decimals, total supply).
- `tereno_get_chain_snapshot`: Latest block, timestamp, base fee, and gas
recommendations.
- `tereno_get_prediction_evidence`: Machine-readable evidence context for prediction
market propositions.
- `tereno_quote_contract_guard`: Cost quote and credit evaluation before running
checks.
- `tereno_list_capabilities`: Active capability schemas, operational TTL windows, and
pricing tiers.
- `tereno_list_bounties`: List available open verification bounties on Base.
- `tereno_publish_contract_fingerprint`: Seed verification caches to earn reuse
dividends.

Supported networks: **Base** (`8453`) and **Base Sepolia** (`84532`).

## Tests

Unit tests executed for schema validation and network support via Jest:
```bash
npx jest src/action-providers/tereno/terenoActionProvider.test.ts

Output:

PASS src/action-providers/tereno/terenoActionProvider.test.ts
  TerenoActionProvider Schemas
    TerenoCheckContractSchema
      ✓ should successfully parse a valid Base EVM address (8 ms)
      ✓ should reject an invalid address format (2 ms)
    TerenoGetTokenMetadataSchema
      ✓ should parse valid token address (1 ms)
    TerenoGetPredictionEvidenceSchema
      ✓ should parse a valid prediction question (2 ms)
      ✓ should reject too short question (1 ms)
    TerenoListBountiesSchema
      ✓ should apply default limit of 20 (1 ms)
  TerenoActionProvider
    ✓ should be an instance of TerenoActionProvider (1 ms)
    ✓ should support Base mainnet and Base Sepolia (1 ms)

Test Suites: 1 passed, 1 total
Tests:       8 passed, 8 total

Checklist

[✓] Added documentation to all relevant README.md files (typescript/agentkit/README.md)
[✓] Added a changelog entry (.changeset/add-tereno-action-provider.md)

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 1 if authored by an app that is not allowlisted and lacks verified human attribution 0 Sum 1