smartcontract: add bgp_status, last_bgp_up_at, last_bgp_reported_at to User

[juan-malbeclabs]

Solves: #3465

Summary of Changes

• Adds three new fields to the onchain User struct: bgp_status (BGPStatus enum: Unknown/Up/Down, 1 byte), last_bgp_up_at (slot number of the most recent BGP up event, 8 bytes), and last_bgp_reported_at (slot number of the most recent BGP status report, 8 bytes)
• Old accounts without these bytes deserialize with zero/Unknown defaults (unwrap_or_default in TryFrom), preserving backward compatibility
• Propagates the new fields to all read-only SDKs: internal Go SDK (smartcontract/sdk/go/serviceability), external Go SDK (sdk/serviceability/go), TypeScript SDK, and Python SDK — each with BGPStatus type/enum and updated deserializers
• Updates the AIRDROP_USER_RENT_LAMPORTS_BYTES constant (723 → 774) to account for the larger User account size (241 → 258 bytes per account)

Diff Breakdown

Category	Files	Lines (+/-)	Net
Core logic	8	+180 / -18	+162
Scaffolding	23	+201 / -1	+200
Tests	5	+69 / -12	+57
Fixtures	5	+34 / -7	+27
Total	41	+485 / -38	+447

Most of the diff is mechanical scaffolding (struct initializations across activator, client, CLI, and SDK commands); the meaningful changes are concentrated in the state definition and SDK deserializers.

Key files (click to expand)

• smartcontract/programs/doublezero-serviceability/src/state/user.rs — adds the three new fields to the User struct, updates TryFrom<&[u8]> with unwrap_or_default, updates backward-compat test to strip 18 bytes, adds assertions for new fields
• activator/src/process/user.rs — 19 User struct initializations updated with new fields
• smartcontract/cli/src/user/list.rs — 18 User struct initializations updated
• sdk/serviceability/go/state.go — adds BGPStatus type with String(), adds BgpStatus, LastBgpUpAt, LastBgpReportedAt to User struct
• sdk/serviceability/typescript/serviceability/state.ts — adds BGP_STATUS_* constants, bgpStatusString(), and new fields to the User interface and deserializer
• sdk/serviceability/python/serviceability/state.py — adds BGPStatus(IntEnum) and new fields to the User dataclass and from_bytes()
• smartcontract/programs/doublezero-serviceability/src/processors/accesspass/set.rs — updates AIRDROP_USER_RENT_LAMPORTS_BYTES (258×3=774) and size assertions in the test
• sdk/serviceability/testdata/fixtures/generate-fixtures/src/main.rs — fixture generator sets bgp_status: BGPStatus::Up, last_bgp_up_at: 1_700_000_000, last_bgp_reported_at: 1_700_000_100

Testing Verification

• make rust-test passes (230+ tests across serviceability program, all SDK crates, activator, client, CLI)
• make rust-lint clean
• Backward-compat test in state/user.rs verifies that truncating the last 18 bytes of a serialized User deserializes tunnel_flags, bgp_status, last_bgp_up_at, and last_bgp_reported_at all as zero/Unknown
• All three external SDK fixture tests (Go, TypeScript, Python) assert the new fields against the regenerated user.bin fixture (258 bytes), plus backward-compat tests using a truncated binary

RFC: rfcs/rfc19-user-bgp-status.md