docs(conferences): refresh venue cycle (2026-2027) + add EuroRust + mapping section

[hyperpolymath]

Updates the technical-conferences venue table to the 2026-2027 cycle; adds EuroRust as a first-class entry (previously absent); marks Strange Loop as sunset 2024. Adds a new "2026-2027 Cycle Submission Mapping" section that walks the operator's three priority venues — FOSDEM 2027, EuroRust 2026, ElixirConf 2026 — and maps each to candidate abstracts already in the asset bank. Surfaces the EuroRust gap explicitly (closest existing abstract is too broad for EuroRust's Rust-systems audience; a focused AffineScript→typed-wasm abstract should be drafted before the May-2026 CFP window). Docs-deliverable side of the project-board "Conference proposals" item; submission step remains gated on each CFP opening + operator go/no-go.

[github-actions]

🔍 Hypatia Security Scan

Findings: 191 issues detected

Severity	Count
🔴 Critical	64
🟠 High	37
🟡 Medium	90

⚠️ Action Required: Critical security issues found!

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