chore(release): v0.262.2 -- remove never-emitted ChainPeakUnavailable

[MichaelTaylor3d]

Release v0.262.2

Brings to main:

• 57c505ff refactor(rewards): remove never-emitted ChainPeakUnavailable (refactor(rewards): remove never-emitted ChainPeakUnavailable (dig_ecosystem#3448) #636)
• release commit: version 0.262.1 -> 0.262.2 + CHANGELOG section (Cargo.toml, Cargo.lock, CHANGELOG.md only)

The removed variant and its REWARD_CHAIN_PEAK_UNAVAILABLE code were never constructed (v0.262.1 included); no consumer exists org-wide, and dig-rpc-protocol SPEC §4.5 names no machine code. An absent chain peak still refuses as JSON-RPC -32032 / data.code CONTROL_ERROR. #636 passed loop-reviewer and loop-security at a9bf40f.

Closes DIG-Network/dig_ecosystem#3448

🤖 Generated with Claude Code

[MichaelTaylor3d]

PASS at e809735.

• Code hunks in port.rs, dispatch.rs, rewards_fixture.rs, rewards_chain_port_a3.rs are byte-identical (+/- lines) to #636.
• Cargo.toml workspace version 0.262.1 -> 0.262.2 only; Cargo.lock only the dig-node-service version line; CHANGELOG adds one [0.262.2] - 2026-10-05 section.
• Body has Closes DIG-Network/dig_ecosystem#3448 outside a code span.
• Note (non-gating): CHANGELOG top entry before this was 0.255.0, so the section sits above 0.255.0 (no 0.262.1 section exists).
• Not run: build/tests (scope was diff identity).

[MichaelTaylor3d]

PASS (loop-security) -- head audited: e8097355ecbcf913b0df4424ad18199462dd775e (base cdc36f9 = v0.262.1)

Narrow scope: #637 adds nothing beyond #636.

• 7 files only: CHANGELOG.md, Cargo.lock, Cargo.toml, 4 Rust files. No workflow, script, or build file touched.
• The 4 Rust files' +/- lines are identical to refactor(rewards): remove never-emitted ChainPeakUnavailable (dig_ecosystem#3448) #636 at a9bf40f (the head I previously PASSED, refactor(rewards): remove never-emitted ChainPeakUnavailable (dig_ecosystem#3448) #636 (comment)).
• Cargo.lock: exactly one line, dig-node-service version 0.262.1 -> 0.262.2. No dependency, source or checksum change.
• Cargo.toml: exactly one line, workspace version 0.262.1 -> 0.262.2.
• CHANGELOG: one new 0.262.2 section describing refactor(rewards): remove never-emitted ChainPeakUnavailable (dig_ecosystem#3448) #636.

No findings. Not covered: CI results, post-merge release workflow behaviour.