CP8 complete. Two design-doc updates in line with the existing

[navicore]

convention (VARIANT_OP_TYPE_SAFETY.md is the precedent — status line +
per-checkpoint annotations):

docs/design/STRING_BYTE_CLEANLINESS.md

• Status line updated to implemented · PR binary in string #436 ... PR cp6 #437 ....
• All 8 checkpoints marked [done · PR #N] with the specific PR that landed each.

docs/design/LIVE_CODING_CSOUND_POC.md

• Status line: Phase A and Phase B implemented, Phase C remains.
• Checkpoint 1 (UDP loopback) and Checkpoint 2 (OSC byte-format) marked done with file paths.
• Checkpoints 3–5 explicitly tagged [Phase C — pending] so it's clear what's left.

Left other shipped design docs (UDP_RUNTIME, IF_AS_COMBINATOR) untouched
— out of CP8's scope and the convention is inconsistent on whether to
retro-update them.

That closes the byte-cleanliness/OSC arc cleanly. Whenever you're ready,
Phase C is the next milestone — actually running Csound with a live.csd
and getting a tone out the speakers.

[claude]

Code Review — PR #440: CP8 Design Doc Updates

Note: This PR is already merged. Review is provided for record-keeping and future reference.

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Overview

A documentation-only PR that closes out the byte-cleanliness/OSC Phase B arc by retroactively annotating two design documents to reflect completed work:

• docs/design/STRING_BYTE_CLEANLINESS.md — status line promoted from design to implemented; all 8 checkpoints stamped [done · PR #N] with implementation notes.
• docs/design/LIVE_CODING_CSOUND_POC.md — new status line added; checkpoints 1–2 marked done with file paths; checkpoints 3–5 explicitly tagged [Phase C — pending].

No code changes.

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What's Done Well

• Follows the established convention. The VARIANT_OP_TYPE_SAFETY.md precedent (status line + per-checkpoint annotations) is applied consistently here.
• Checkpoint details are actionable. Completed checkpoints now include exact file paths and the specific PRs that landed each piece of work, making traceability easy.
• Pending work is clearly scoped. Tagging checkpoints 3–5 as [Phase C — pending] rather than leaving them as bare future tense removes ambiguity about what's left.
• Scope discipline. Correctly leaves UDP_RUNTIME and IF_AS_COMBINATOR untouched — the PR description even explains the reasoning, which is helpful for reviewers.

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Minor Issues

1. Checkpoint 8 in STRING_BYTE_CLEANLINESS.md is missing a PR reference (minor inconsistency)

Every other completed checkpoint cites a specific PR:

8. **[done]** `just ci` is green end-to-end ...

All others follow [done · PR #N]. Since CI greenness is a property of all the preceding PRs rather than one specific commit, consider:

8. **[done · PRs #436 + #437 + #439]** `just ci` is green end-to-end ...

or a brief note like [done — covered by PRs above] to make the omission intentional rather than accidental.

2. Status line in LIVE_CODING_CSOUND_POC.md is dense (cosmetic)

Status: Phase A and Phase B implemented · PR #434 (UDP runtime),
#436 (string byte-cleanliness), #437 (OSC encoder + byte
construction primitives), #439 (OSC-over-UDP loopback) · 2026-04-27 ·
Phase C (Csound `live.csd` + audible kick) remains.

The four inline PR parentheticals make it a bit hard to parse at a glance. A minor alternative would be to split "Phase C remains" onto its own line to reduce visual crowding, but this is entirely stylistic.

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No Concerns On

• Correctness — the PR reference numbers match the work described in the PR body.
• Security / Performance — not applicable (docs only).
• Test coverage — not applicable.
• Scope creep — none.

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Summary

Clean documentation housekeeping that follows project conventions. The one minor inconsistency (checkpoint 8 missing a PR citation) is low priority but worth a one-word fix in a follow-up if the pattern matters to you. Otherwise, this is exactly what a doc-update PR should look like.