docs: add ROADMAP.md with milestone scope, decisions, and deferred items

Captures v3.0.0 remaining work, completed items, the GitHub repo rename
deferral rationale (business timing, no FUNDING.yml impact), and
upcoming v3.1.0/v3.2.0 scope. Process rule added: business decisions
go here and in GitHub issue comments — not only in AI memory.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ROADMAP.md

@@ -0,0 +1,82 @@
+# freenas-proxmox / truenas-proxmox — Roadmap
+
+This file captures release scope, business decisions, and deferred items. It is updated in the same commit as any scope or decision change — not just in issues or memory.
+
+---
+
+## Current Release — v3.0.0 (TrueNAS Custom Plugin)
+
+**Branch:** `release/3.x`  
+**Target:** Ship before PVE 8 EOL (2026-08-31)
+
+Full rewrite as a native `PVE::Storage::Custom` plugin. No patching of PVE files, no SSH, full TrueNAS REST API, bearer token auth only.
+
+### Remaining open items
+
+| # | Title | Type |
+|---|-------|------|
+| [#250](https://github.com/TheGrandWazoo/freenas-proxmox/issues/250) | Rollback orphaned TrueNAS resources on `alloc_image` partial failure | bug / code |
+| [#228](https://github.com/TheGrandWazoo/freenas-proxmox/issues/228) | Migration path v2.x→v3.x docs | docs |
+| [#252](https://github.com/TheGrandWazoo/freenas-proxmox/issues/252) | Integration test 2.x→3.0 upgrade path docs | docs |
+
+### Completed in v3.0.0
+
+| # | Title | Commit |
+|---|-------|--------|
+| [#261](https://github.com/TheGrandWazoo/freenas-proxmox/issues/261) | API token keyfile (`/etc/pve/priv/truenas-<id>.key`) | `f30862f` |
+| [#262](https://github.com/TheGrandWazoo/freenas-proxmox/issues/262) | Package rename: `freenas-proxmox` → `truenas-proxmox` (transitional package ships) | `9b2ecb8` |
+| [#263](https://github.com/TheGrandWazoo/freenas-proxmox/issues/263) | Fix `truenas_target` full-IQN match | `3a8a5df` |
+| [#260](https://github.com/TheGrandWazoo/freenas-proxmox/issues/260) | TPM state disk limitation callout in README | `0a8e7e7` |
+
+---
+
+## Deferred Business Decisions
+
+### GitHub Repo Rename: `freenas-proxmox` → `truenas-proxmox`
+
+**Status:** Deferred — no timeline set  
+**Decision date:** 2026-05-25  
+**Tracked in:** [#262](https://github.com/TheGrandWazoo/freenas-proxmox/issues/262) (comment)
+
+All code is ready: the `truenas-proxmox` package is built and published; the transitional `freenas-proxmox` package is in place. GitHub URLs in docs are already updated to the new name.
+
+The actual `gh repo rename` on GitHub has been deliberately held. This is a business-timing decision — GitHub redirects old URLs automatically so there is no technical urgency. The rename can be done at any time by running:
+
+```bash
+gh repo rename truenas-proxmox --repo TheGrandWazoo/freenas-proxmox
+```
+
+**Note:** `FUNDING.yml` contains only `github: TheGrandWazoo` (tied to the user account, not the repo). The rename has **no effect** on GitHub Sponsors.
+
+---
+
+## Upcoming — v3.1.0 (PVE 9 + Snapshots)
+
+**Target:** Before PVE 8 EOL — 2026-08-31
+
+| # | Title |
+|---|-------|
+| [#234](https://github.com/TheGrandWazoo/freenas-proxmox/issues/234) | Snapshot interface (Snapshot-as-Volume-Chains, PVE 9.0+) |
+| [#249](https://github.com/TheGrandWazoo/freenas-proxmox/issues/249) | Per-variant dispatch (TrueNAS-Core.pm / TrueNAS-Scale.pm) — evaluate |
+| [#256](https://github.com/TheGrandWazoo/freenas-proxmox/issues/256) | Multipath support |
+
+---
+
+## Upcoming — v3.2.0 (WebSocket API, SCALE 25.x)
+
+**Target:** After PoC testing on SCALE 25.04 Fangtooth and 25.10 Goldeye  
+**Scope:** TBD pending PoC results
+
+| # | Title |
+|---|-------|
+| [#243](https://github.com/TheGrandWazoo/freenas-proxmox/issues/243) | WebSocket JSON-RPC 2.0 API support (TrueNAS SCALE 25.04+) |
+
+**Lab note:** A TrueNAS SCALE 25.04 node is available for PoC testing (stood up 2026-05-25, minimal config).
+
+---
+
+## Process Rules
+
+- Every business decision (defer, hold, change scope) is recorded here **and** as a comment on the relevant GitHub issue — not only in conversation or AI memory.
+- ADRs (in `.claude/cos/adrs/`) capture architectural decisions.
+- This file captures timing, business rationale, and deferred actions.