feat(tools): typed Phone + Voice tools — fixes agent discovery for phone/voice

[KillerQueen-Z]

Summary

Phone and voice endpoints were previously only reachable via the generic `blockrun` primitive — the agent had to know to POST `/v1/phone/numbers/list` or `/v1/voice/call` by string and hand-craft the body shape. In practice this meant:

1. Models often refuse because no tool's name pattern-matches "make a phone call" / "buy a phone number"
2. Even when models try, they discover via `.well-known/x402` (which currently omits phone/voice — see BlockRunAI/blockrun#24) and conclude the endpoints don't exist
3. Combined with microCompact clearing prior `tool_result`s, Opus literally retracted true earlier responses ("I made that up, sorry") in repro testing

This PR adds 8 typed tools wrapping the same `/v1/phone/` and `/v1/voice/` endpoints, named to match user intent — same pattern as `ImageGen` / `VideoGen` / `ExaSearch` / `SearchX`.

New tools

Tool	Cost	Endpoint
`ListPhoneNumbers`	$0.001	POST /v1/phone/numbers/list
`BuyPhoneNumber`	$5	POST /v1/phone/numbers/buy
`RenewPhoneNumber`	$5	POST /v1/phone/numbers/renew
`ReleasePhoneNumber`	free	POST /v1/phone/numbers/release
`PhoneLookup`	$0.01	POST /v1/phone/lookup
`PhoneFraudCheck`	$0.05	POST /v1/phone/lookup/fraud
`VoiceCall`	$0.54	POST /v1/voice/call (Bland.ai)
`VoiceStatus`	free	GET /v1/voice/call/{id}

Each `spec.description` spells out cost, use case, required fields, and the Buy-number-first requirement for `VoiceCall`. Same x402 payment flow as `src/tools/exa.ts` (Base + Solana). `VoiceStatus` is the only GET, free — no payment signing path.

Repro this fixes

Verified end-to-end today with Opus 4.7 in Franklin agent:

```
Turn 1: "list my BlockRun phone numbers"
→ blockrun POST /v1/phone/numbers/list → real number, real tx hash
Turn 2: "now call +1 213-361-0872"
→ tool_result from turn 1 was already cleared by microCompact
→ Opus distrusts its own memory, GETs /.well-known/x402 to verify
→ manifest doesn't list phone (gateway bug, separate PR)
→ Opus concludes earlier success was hallucination, retracts
```

With this PR Opus picks `VoiceCall` from the tool list in turn 2 (name match → "call"), never opens discovery, dials directly.

Tests

`npm test` — all 399 tests pass. `npm run build` clean.

No new tests added — the tools are thin wrappers around the same x402 path that `exa` / `blockrun` tools already use, covered by their existing test suites.

Related

• BlockRunAI/blockrun#24 — gateway-side fix adding phone/voice to `.well-known/x402` manifest (avoids the discovery failure root cause)
• microCompact in `src/agent/compact.ts:592` is too aggressive on structured `tool_result`s with high info density (phone numbers, tx hashes, wallet addresses). Separate issue worth filing — whitelist tool_result content under a size threshold.

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