chore + fix: bookkeeping consolidation + complete ≤a-⊔a-univ baseline-rot

[hyperpolymath]

Summary

Three independent bookkeeping items consolidated to avoid PR churn:

1. CLAUDE.md "Current rung state (2026-05-20)" — full session arc for the echo-types swarm (PRs docs: rule out 2-categorical shape; credit landed EchoApprox + EchoDecidable in roadmap #67-theory: AntiEcho × IsArgmin tropical decomposition #72, theory: EchoApprox deeper rung — separated zero-collapse + axis-1 shadow #74-docs: Gate 1 adjacency refresh — cross-check 5 notes against current taxonomy #77). §"Theory work — no proof assistant needed" is now essentially closed (Lane 2 BalancedTolerance is theory: EchoApprox Rung C — BalancedTolerance + full B/budget round-trip #78, awaiting review). Two patterns formalised (per-lemma Smoke pin for parameterised modules; sandbox.excludedCommands workaround for the agda positional-arg sandbox quirk). Plan for next Claude included.

2. EchoAccess Lift ⊤ carrier — design closure. The post-theory: Axis 8 sweep — join + composition trio (Rungs A + B; Rung C deferred) #75 carrier-honesty work hit a structural wall on the owner-authorised existential design: degrade-access becomes uninhabitable because the access lattice tracks decreasing information as you climb, so degrading must drop info, never fabricate it. Conclusion: Lift ⊤ IS the right honest carrier at the top of the lattice (same sense as EchoGraded.forget = ⊤). New docs/echo-types/decisions/echo-access-trivial-carrier.adoc captures the closure; EchoAccess.agda module header updated from "Deferred to follow-up" to "Resolved 2026-05-20" with the structural reasoning.

3. Complete ≤a-⊔a-univ baseline-rot — 10 more wrong-RHS clauses in the same family as commit a8ac211 (which fixed only some of the strict-inequality witnesses). Discovered by Agda 2.8.0 on a clean .agdai cache; previous "verified green" reports were spuriously passing because of stale incremental builds. Same diagnosis: when c1 ⊔a c2 = c2 (strict c1 < c2), the universal property witness needs c2≤c shape (p2), not c1≤c shape (p1). Fixed clauses span the decidable/enum/feasible/infeasible rows.

Test plan

• LC_ALL=C.UTF-8 agda -i proofs/agda proofs/agda/All.agda exits 0 on Agda 2.8.0
• LC_ALL=C.UTF-8 agda -i proofs/agda proofs/agda/Smoke.agda exits 0 on Agda 2.8.0
• --safe --without-K invariants intact
• No postulates introduced
• No escape pragmas
• CI Agda check passes
• AsciiDoctor render of new decisions adoc (no asciidoctor in environment; hand-inspected against decisions/no-2-cat.adoc template)

Refs CLAUDE.md "Rung-consolidation policy" §4 ("Update machine docs"). Does not close any issue.

[github-actions]

🔍 Hypatia Security Scan

Findings: 10 issues detected

Severity	Count
🔴 Critical	0
🟠 High	5
🟡 Medium	5

View findings

[
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    "action": "create",
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    "action": "pin_sha",
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    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
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    "action": "auto_fix",
    "rule_module": "scorecard",
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    "scorecard_check": "Dependency-Update-Tool"
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    "reason": "Nominal-only SAST in echo-types: codeql.yml language matrix contains no language present in the repo and lacks `actions`, so CodeQL records zero results on every commit. Remediation: set the CodeQL matrix to `language: actions`.",
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    "file": "/home/runner/work/echo-types/echo-types",
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    "remediation": "Add CodeQL or equivalent SAST workflow.",
    "scorecard_check": "SAST"
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    "reason": "1 workflow(s) with tag-pinned (not SHA-pinned) actions in echo-types",
    "type": "DependencyPinning",
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    "rule_module": "scorecard",
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    "scorecard_check": "Pinned-Dependencies"
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    "reason": "Repository has 1 non-main remote branch(es). Policy: single main branch only.",
    "type": "GS007",
    "file": ".",
    "action": "delete_remote_branches",
    "rule_module": "git_state",
    "severity": "medium"
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]

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