v3.1.1

A patch, following a quick targeted re-check of v3.1.0 requested right after it shipped. Two independent review passes ran: a direct re-read of everything changed in v3.1.0, and a second opinion from a locally-run AI model (Ollama, model ornith:9b) given the full plugin source and asked for concrete, high-confidence issues only. Every finding from both was independently verified against the actual files before being treated as real.

Fixed: a tool-grant mismatch in the new "ecosystem finder" — it told the Researcher to check what's already installed using a command it doesn't actually have access to run. Fixed by having the Builder (which does have that access) do the check instead.

Fixed: the README's version banner still said "3.0.4" after v3.1.0 shipped. Corrected to 3.1.0, with an accurate description of what's actually new.

Fixed: the README and the internal role list disagreed on how "Maintenance Agent" is categorised. Checked its actual behaviour and corrected the internal list to match the README, which had it right.

No behaviour change for anyone not yet using the two new v3.1.0 abilities. Verified: 63/63 automated tests, every integrity/roster/licence check clean, strict plugin validation passing, all on a fresh clone of the actual published repository before this release.