Integrate squid-evm-funding with Filecoin payment commands

[snissn]

Parent: #28

Depends on: FilOzone/squid-evm-funding#4

Goal

Use squid-evm-funding to acquire only Filecoin Pin's existing FIL/USDFC wallet shortfalls in both payments fund and payments setup --auto.

Required Behavior

• Start from current upstream master, not fork master or PR feat(payments): support selected EVM funding sources filecoin-project/filecoin-pin#630.
• Preserve existing Filecoin Pay funding plans and automatic-setup targets as the only target authority.
• Add one thin adapter from Filecoin requirements/policy to the library.
• Reuse the same adapter from both commands.
• Preserve direct funding and zero-shortfall behavior with zero Squid/source-RPC calls.
• Keep chain allowlists, native-fee ceilings, Filecoin reserves, environment resolution, checkpoint paths, prompts, and CLI output in Filecoin Pin.
• Pin an immutable library revision for the draft; npm publication is not required to open it.
• Fail acquisition closed outside Filecoin mainnet.

Ponytail Boundary

Do not copy the old acquisition directory. Do not add a provider interface, wallet adapter, route/status parser, fee engine, or recovery state machine to Filecoin Pin. Reuse existing command helpers and add the fewest files needed for the adapter.

Test-First

Start with focused command-level regressions:

1. zero shortfall produces no library/provider/source-RPC call;
2. payments fund passes exact shortfalls and resumes existing Filecoin Pay deposit behavior;
3. payments setup --auto uses its existing target and completes deposit/approval/readiness;
4. Calibration/devnet acquisition fails before provider activity;
5. interrupted acquisition reruns through library recovery without duplicate spending.

Performance Classification

Possibly performance-relevant. Use mock call counts as the guardrail. No benchmark is required.

Exit Gate

• One adapter serves both commands.
• No Squid implementation logic is duplicated locally.
• Focused and broader affected tests pass.
• Cross-platform build/typecheck/lint/browser gates pass.
• Latest-head CI and mature review pass before squash merge into the integration branch.

[snissn]

Completed by #32, merged into the non-default integration/squid-evm-funding branch at 37a1d88186aa23394a306795a5ad8903b8a0fc43. The dependent documentation, environment, devnet, Calibration, and upstream-draft gates remain in #30.