proof: make Phronesis.agda compile; integrate echo-types (verdict provenance)

[hyperpolymath]

What

Phronesis's flagship intrinsically-typed safety formalisation Phronesis.agda now type-checks (exit 0) for the first time, and echo-types is wired into its semantics.

Root fixes to Phronesis.agda (it never compiled before)

• Context-cons _,_ → _,,_ — resolves a mixfix parse ambiguity against Data.Product._,_.
• Drop two illegal using (…) renaming (…) repeats (stdlib v2.3 / Agda 2.6.3 reject names listed in both).
• Complete the unsound, incomplete _≟ᵗ_ into a sound total decidable type-equality (mutual _≟ᵗ_/_≟ᶠ_, structural; the old catch-all no (λ ()) claimed every pair unequal incl. TInt ≟ᵗ TInt).
• Fix _<ᵛ_ operator precedence + implicit inference (Bool !=< ℤ).

echo-types integration

PhronesisEcho.agda — an ethical verdict's provenance IS Echo verdict v: eval is non-injective, so the fiber retains which expressions justify a verdict the bare Bool forgets. Headline verdict-forgets-provenance; proj₁ is the section recovering the source. Adds phronesis-formal.agda-lib (depend: echo-types).

Verification

Phronesis.agda + PhronesisEcho.agda: 2/2 pass (Agda 2.6.3 + stdlib v2.3 + echo-types), machine-checked against the real echo-types library.

🤖 Draft opened by Claude Code.

https://claude.ai/code/session_01DQACj3RFmAPZaBPgR9SAaS

---

Generated by Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 38 issues detected

Severity	Count
🔴 Critical	0
🟠 High	10
🟡 Medium	28

View findings

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[github-actions]

🔍 Hypatia Security Scan

Findings: 33 issues detected

Severity	Count
🔴 Critical	0
🟠 High	9
🟡 Medium	24

View findings

[
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    "reason": "Action trufflesecurity/trufflehog@main needs attention",
    "type": "unpinned_action",
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