dsh-keepalive v0.2.4

Repair scope extended to GitHub-installed user plugins under profiles/web/node_modules/dsh-* (snapshot/diff/rollback now cover them; official @deepseek-ai packages stay out of scope). Repair agent runs with cwd = the web profile and its prompt names both allowed trees. Repair model requests reasoningEffort max by default (configurable via keepalive.repairReasoningEffort). Headless timeout raised to 900s with an explicit TIMED OUT log marker.