Ratified 2026-07-24. S13 is re-pointed rather than resolved: the tuning context
is not a special case, it is field 10 of an eight-field gap that
spec/ANALYSIS_GENESIS_PERSISTENCE.md tables across the whole Score —
canvas.layout_defaults, instruments, staff_groups, parts, tuning_context,
spelling_precedence, analysis_layers, views, plus identity, with
decomposition_attachments prunable-but-never-authored. Each is reachable only
through a base the reducer is handed, and pruning is licensed to replace that
base with a MaterializedState carrying none of them.
Independently re-verified against the working tree before recording: every one
of those fields' sole reduce.rs mention is a read-only base-seed read, and
epiphany-ops has no tuning-context payload at all.
So the entry drops the operation-vs-canonical-base framing it was filed with.
That framing was right about the axis and wrong about the scope: it maps onto
the analysis's dispositions B and C at eight times the size, and a
tuning-specific fix is exactly the shape the analysis argues against — "any
option that enumerates fields must be re-audited against this table every time
a field is added to Score". S13 is now marked blocked-on rather than open, and
whichever disposition the genesis ruling picks resolves it as a side effect.
The accept-set cost this entry surfaced is kept, repositioned as evidence
against enumerated per-field fixes rather than as a tuning-only tradeoff:
blocks stamp minimally, and bundle.rs caps OperationEnvelopeBlock at major 2
precisely because no operation payload embeds the tuning context, so a
SetTuningContext-style operation would drag a role accept-set raise along with
the kind append — for one field of eight.
The wire layouts stay frozen and correct under every disposition. This was
never about how the tuning context encodes, only about which carrier embeds it,
so epiphany-core's DECISIONS entry now records the matching prohibition: no
SetTuningContext operation, and no widening of ScoreTuningContext's layout to
compensate.
Docs only; no code path touched. Gate unchanged: fmt clean, 1336 passed /
0 failed, requirement labels 6/6 at 212/282/282.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QjsEnYhm1gPpf6ii2iFxFV
Levi Neuwirth
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