docs(rewards_claim): replace stale "not yet wired" claims

[MichaelTaylor3d]

Replace stale "not yet wired" claims in rewards_claim doc comments.

Changes:

• crates/dig-node-service/src/rewards_claim/config.rs:63-68 — R5 comment now describes actual wiring (enabled + sync both true)
• crates/dig-node-service/src/rewards_claim/engine.rs:248-250 — driver.rs now calls wiring method in production
• crates/dig-node-service/src/rewards_claim/driver.rs:1863 — clarify "no chain adapter" → "chain port always Unavailable"
• crates/dig-node-service/src/rewards_claim/port.rs:16 — "is wired yet" → "is reachable"

Refs DIG-Network/dig_ecosystem#3441

🤖 Generated with Claude Code

[MichaelTaylor3d]

security audit (loop-security) — PR #638 @ afb2656

PASS

• Non-doc changed lines: 0 (23 +/- lines, all /// or //!; verified by grep over gh pr diff).
• config.rs R5 text: consistent with decide_claim_driver (driver.rs:645): Spawn only when enabled AND enable_chain_sync; otherwise Disabled / ChainSyncDisabled. ClaimDriverRefusal::ChainSourceUnbuildable exists in driver.rs, so the "zero cycles" claim is grounded. An operator is not misled either way ("necessary, not sufficient").
• No code, dependency, or persisted-state change.

Not covered: runtime behaviour (no code changed). KG: NONE (doc-only, no durable finding).

[MichaelTaylor3d]

PASS at afb2656 (loop-reviewer, independent gate).

Verified against code at head:

• config.rs R5: spawn gated by decide_claim_driver(enabled, enable_chain_sync) (driver.rs:645), called via spawn_claim_driver_from_config (driver.rs:695) from server.rs:2374 with config.enable_chain_sync; unbuildable source -> set_refusal(ClaimDriverRefusal::ChainSourceUnbuildable) then return, no cycle (driver.rs:362); mod.rs:36 heading "# Wired into node startup" exists.
• engine.rs: doc sits on pub(crate) fn with_persisted_fee_window; run_claim_driver_in_with_clock (driver.rs:558) calls .with_persisted_fee_window( at :601. True.
• driver.rs test doc: engine built with UnavailableClaimChainPort, which returns only Err(ClaimPortError::Unavailable). True.
• port.rs: "No chain source is reachable" correct for Unavailable.
• No new sentence asserts another ticket's landed/not-landed status (the stale "#3268, not yet landed" / "Not yet wired" text is removed; grep -c 'Not yet wired' mod.rs = 0).
• Intra-doc links: no new links; only pre-existing [crate::rewards_claim]. ClaimDriverRefusal::ChainSourceUnbuildable is in backticks, not a link.
• Doc-comment-only diff: YES (4 files, only /// lines changed) -> eligible for the section 2.4c docs-only path.

Not run: cargo doc / CI (not needed for comment-only diff; confirm required checks green before merge). Out of scope per brief: types.rs:265.
Open threads: 0.