docs(backlog): sync FEAT-BEACON-REQUESTED-FREQS status to merged

[FullGas1]

Summary

• .backlog/README.md still listed FEAT-BEACON-REQUESTED-FREQS as "waiting-human (branch pushed, PR to open)" after PR feat(beacon): let a caller request a beacon frequency per band #128 merged 2026-08-24 — the closing-PR status update was missed.
• Syncs the index line to merged (PR #128).

Test plan

• Docs-only change, no code/tests affected.

Summary by Sourcery

Documentation:

• Update the backlog index to record FEAT-BEACON-REQUESTED-FREQS as merged in PR feat(beacon): let a caller request a beacon frequency per band #128.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the backlog index entry for FEAT-BEACON-REQUESTED-FREQS to reflect that PR #128 merged, with no code or test changes.

File-Level Changes

Change	Details	Files
Synchronize the backlog index with the merged status of the requested beacon frequencies feature.	Replace the stale waiting-human status with merged (PR #128). Leave the feature description, PRD link, and branch reference unchanged.	.backlog/README.md

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