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feat(fidelity): build Fibre on Echo; reclassify EchoFidelity as Tier 1 - #347
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Fibre T t is now Echo (account T) (mapped t) rather than a hand-written Sigma, so the structure theory of Echo applies to fibres with no transport (fibre-is-echo is refl). Adds mapped-in-fibre and the dropped-not-in-fibre lemma: an atom with a drop reason cannot also be the source of a target atom. The module now imports Echo and stdlib only, so it moves from the standalone-draft row to Tier 1 in the kernel note. Type-checks under Agda 2.6.3 / stdlib 2.3, --safe --without-K, no postulates. Still unwired from All.agda and Smoke.agda; docs/echos status updated from unverified to type-checked. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MF5GeeBBDF6sUzr6pZTjWV
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Summary
Stacked on #346 (base is its branch, so the diff shows only this change).
EchoFidelity.Fibrewas a hand-written Σ-type with noEchoimport. It is nowEcho (account T) (mapped t)by definition, so the structure theory ofEchoapplies to fibres directly, and the module becomes a genuine Tier 1 derived module (onlyEcho+ stdlib).Changes
proofs/agda/EchoFidelity.agda: importsEcho;Fibre T t = Echo (account T) (mapped t); addsfibre-is-echo(refl),mapped-in-fibre,fibre-of-image(viaecho-intro), anddropped-not-mapped/dropped-not-in-fibre(an atom with a drop reason cannot also be the source of a target atom). The stale "NOT YET TYPE-CHECKED" header is replaced. The 4-vs-5 direction check is untouched.docs/echo-types/echo-kernel-note.adoc:EchoFidelitymoves from docs(kernel): classify EchoFidelity as a standalone draft outside the kernel cone #346's standalone-draft row into the Tier 1 list; that row is removed.docs/echo-types/MAP.adoc,docs/echos/README.adoc,docs/echos/FIDELITY-FIBRE-DESIGN.adoc,docs/echos/BOT-PROMPT.adoc: status wording updated (type-checked;FibreisEcho).Not changed: the module is still not wired into
All.agda/Smoke.agda, as its header and the bot brief require until you ask. The design note's limits ("does not show that matched atoms mean the same") are unchanged; this proves bookkeeping facts, not fidelity.Verification
agda -i proofs/agda proofs/agda/EchoFidelity.agda: exit 0 (Agda 2.6.3, stdlib 2.3).sh scripts/kernel-guard.sh: PASS.bash tools/check-guardrails.sh proofs/agda: OK (210 modules).Merge order
Merge #346 first. Because it adds the row this PR removes, I will rebase this branch onto
mainafterwards (it is my branch) so the removal applies cleanly.Generated by Claude Code