v2.5.0 — One-shot autonomous build + Next.js 16 stack refresh

Full-repo audit pass (link integrity 1856 refs / 0 broken, 115 tests green, MCP server + evals verified) closed the one remaining gap for the "site in one prompt" scenario and refreshed the stack standard.

Added

• rules/21-one-shot-build.md — protocol for single-prompt builds with no dialogue: Assumption Ledger replaces clarifying questions, mini-MASTER locked inline, Design Dials default one notch bolder (variance 6 — distinctive beats safe when there is no feedback loop), mandatory rule-20 self-verification, deliverable = site + ledger + verification evidence + max 3 open questions. Overrides the Junior Pass blocking step from rules/00 in autonomous contexts.
• pytest.ini — root python -m pytest -q no longer collides with the mcp-server/tests package.

Changed

• Stack standard: Next.js 15 → 16 across SKILL.md, README, tech-standards, performance/SaaS rules, blueprints, integrations (Cursor / ChatGPT / Copilot), MASTER template. references/tech-standards.md documents the 16 deltas: Turbopack default, Cache Components (PPR) + "use cache", proxy.ts replacing middleware.ts, stable React Compiler.

Principle distilled: in one-shot mode the user is not the QA loop — assumptions get declared, not asked, and verification carries the full weight of the conversation that didn't happen.