feat(action-providers): add AlgoVault action provider

[AlgoVaultFi]

Description

This PR adds a new AlgoVault action provider, giving AgentKit agents native access to AlgoVault's crypto trading signals: composite BUY/SELL/HOLD trade calls, market-regime classification, and cross-venue funding-rate arbitrage scanning.

• Walletless + read-only data provider (supportsNetwork returns true for all networks), modeled on the existing messari / defillama providers.
• Speaks MCP directly to the AlgoVault MCP server (api.algovault.com/mcp) over Streamable HTTP via @modelcontextprotocol/sdk (the same SDK already used in framework-extensions/model-context-protocol).
• Keyless free tier — works out of the box, no API key required. An optional ALGOVAULT_API_KEY (constructor config or env var) unlocks paid-tier limits.
• Actions (mirroring the live AlgoVault tools): get_trade_call (free), get_trade_signal (backward-compat alias), get_market_regime, scan_funding_arb.
• zod input schemas mirroring the live tool inputs; structured error handling that surfaces AlgoVault's suggested_* guidance fields.
• All verdicts are backed by AlgoVault's verified, on-chain (Base Merkle-anchored) track record: https://algovault.com/track-record

Tests

cd typescript/agentkit && pnpm test
# Test Suites: 61 passed, 61 total
# Tests:       889 passed, 889 total   (25 new for the algovault provider)

Live, keyless end-to-end invocation through the built provider (no API key — free tier):

Setup:  algoVaultActionProvider()           // keyless free tier
Prompt: get_trade_call { coin: "BTC" }

{
  "call": "HOLD",
  "confidence": 15,
  "price": 63875.4,
  "indicators": {
    "funding_rate": -0.00001279,
    "funding_state": "ELEVATED",
    "oi_change_pct": -3.7,
    "volume_24h": 30049729955.29,
    "trend_persistence": "HIGH",
    "underlying_session": "ALWAYS_OPEN"
  },
  "regime": "TRENDING_UP",
  "reasoning": "Trending regime, upward bias. Funding pressure elevated; one-sided crowd forming. Volatility neither expanding nor compressed. Trend persistence elevated; momentum structure. No actionable setup at this snapshot.",
  "coin": "BTC",
  "timeframe": "15m",
  "_algovault": { "version": "1.20.0", "tool": "get_trade_call", "exchange": "BINANCE" }
}

Checklist

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

[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 Sum 1

[AlgoVaultFi]

👋 Friendly nudge on this one. It's been ~11 days — CI is green on the auto-run checks (StepSecurity, labeler), and the Format / Lint / Unit-Test workflows are queued awaiting a maintainer's "Approve and run" (first-time contributor). It's a small, walletless, read-only provider: 4 actions over an MCP endpoint, keyless by default, 25 new tests, following the existing messari / defillama pattern. Happy to address any feedback quickly — thanks for taking a look! 🙏