docs(changelog): add 2026-05-30 — Slice 3+4 Route A arc + bridge + proof-debt

[hyperpolymath]

Summary

• Adds ### Added (2026-05-30) + ### Fixed (2026-05-30) sections to CHANGELOG.md under [Unreleased]
• Documents three cohorts that landed today: the Slice 3+4 Route A 6-PR arc + docs: stale-claim sweep after Slice 3+4 Route A 6-PR arc (#165-#170) #171 doc sweep + docs: enumerate exploratory truncation postulates in docs/proof-debt.md #172 proof-debt; the cross-repo ephapax L3 bridge package (docs: ephapax bridge package (#125 + #127) + EchoTypes.jl v0.2.0 surfacing (#132) #161, docs+proofs: EchoEphapaxBridge.agda NARROW stub (closes #126) #162, docs: ephapax bridge adjacency cleanup (3-file follow-up to #161 + #162) #163); the meta cohort (fix(hypatia): scope-narrow agda_postulate alert on Exploratory module via inline allow #156, docs(roadmap): close Lane 5 (killer-app accepted) + refresh stale Lane 1 close-out annotation #157, audits: assail-classifications.a2ml — Track-C suppressions (echo-types#113) #158, chore: remove arghda-core/ subtree + cross-refs (extracted to standalone repo per #159) #160)
• Format matches 2026-05-28's depth

Why

The CHANGELOG.md hadn't been updated since 2026-05-28 — today's 15+ merged PRs were undocumented. Drift-correction.

Test plan

• No code changes; only CHANGELOG.md edited
• Format follows the existing Keep-a-Changelog convention
• GPG-signed

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 42 issues detected

Severity	Count
🔴 Critical	1
🟠 High	22
🟡 Medium	19

⚠️ Action Required: Critical security issues found!

View findings

[
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    "reason": "Action rpolymath/standards/.github/workflows/governance-reusable.yml@main\n needs attention",
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]

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