docs: enforce questions-first process; remove proposal/plan; update AGENTS and SeedPrompt

collab/proposals/00-bootstrap.md

@@ -1,19 +0,0 @@
-# 00 — Bootstrap — Proposal
-
-Purpose: Formalize the collaboration scaffolding and initial workflow.
-
-Scope:
-- Use `collab/` directory to host questions, proposals, and plans.
-- Adopt filename pattern: `<step-or-subject>-<type>.md`, where `<type>` ∈ {`questions`, `proposal`, `plan`}.
-- Maintain `AGENTS.md` with working conventions and agent guidance.
-
-Deliverables (this step):
-- collab/questions/00-bootstrap.md (moved from root QUESTIONS.md)
-- collab/proposals/00-bootstrap.md (this file)
-- collab/plan/00-bootstrap.md (skeleton)
-- AGENTS.md (initial content)
-- SeedPrompt.md updated with an Addendum describing this structure
-
-Acceptance Criteria:
-- Repo contains the above files with agreed naming scheme.
-- CI not required; manual review suffices for this step.