Plan · CHG-2026-014918 · Agentic SDLC

change_id: CHG-2026-014918
risk_class: R2
autonomy_tier: A2
controls: ['TRC-01', 'CHG-04']
data_classification: internal
originator: olaf@freundcloud.com
agent_identity: svc-agent-platform
model_route: gateway/tier-frontier
supersedes: None

Approach

One page, one native element, no library. The only decision with consequences is the encoding, because it is permanent.

Files

site/**
README.md

Sequence

Encode mono 64k with +faststart into site/assets/audio/. → verify: ffprobe reports 1 channel, ~64 kbps, unchanged duration.
Write site/listen.md with the player, the provenance note and the navigation caveat.
Link it: _config.yml nav, a home-page pointer, a README line.
make build test lint gates. → verify: green, TRC-01 satisfied by site/**.
Push, then request the live URLs. → verify: page 200; audio 200 with an audio content-type and range support.

Risks

Risk	Likelihood	Mitigation
50 MB committed by reflex and unremovable	high — the file was already sitting in the root	Encode first, commit the derivative, never `git add` the original
Git LFS breaks playback on Pages	certain if used	Not used. Pages does not resolve LFS objects
13 MB downloaded by every visitor	high	`preload="metadata"` — bytes move only when play is pressed
Synthetic narration read as authored analysis	medium	Stated on the page, in the same terms the repository already applies to simulated terminals
A visitor navigates and the audio stops	certain	Said on the page rather than discovered

Rejected

Committing the 50 MB original. Four times the bytes, permanently, for no audible gain on speech.
Git LFS. Pages serves the pointer, not the audio.
An external host. A dependency, an account and a link that rots, for one file the site can serve itself.
A JavaScript player. The native element is accessible and adds no third-party script to a site whose playbook argues about supply chain.
A generated transcript. Wanted, but unverified machine transcription published beside the audio is a second source of truth that disagrees with the first. Its own change.

Tests

make build test lint gates
ffprobe on the shipped asset
Live: page and asset both 200, asset supports range requests

Rollback

Delete the page, the nav entry and the links. The asset stays in history regardless, which is the reason R1 is decided carefully rather than quickly.