v0.2.5 — drift checks and release docs

Highlights

• Upgrades MCP payload drift guard from warning-only to blocking checks for old brand/service terms.
• Adds daily MCP Drift Check workflow covering live tool contracts, payload guardrails, version consistency, and local agent metadata.
• Encodes submit_lead as name plus phone-or-wechat in skill.json and manifest checks.
• Expands README release status, drift badge, install-path clarity, privacy notes, CONTRIBUTING, and issue template.

Validation

• bash scripts/check_manifest.sh
• python3 scripts/check_mcp_drift.py
• bash scripts/mcp_smoke_test.sh
• GitHub Actions: CI and MCP Drift Check succeeded on main.