Wire ROADMAP.md through the standards docs

ROADMAP.md was named as a destination in two places but never created,
indexed, or read back. Add the convention to how-i-work.md, note it after
the README decision tree and in the loads-when table, give it a row in the
portability layer table, make the retrofit prompt create it, and have
handoff seed it and pull from it when Current state's next steps run thin.

retrofit-playbook.md

@@ -80,7 +80,7 @@ Paste, one after another:
 
 > **A — knowledge:** Based on everything we've done in this project, write an AGENTS.md at the repo root that a fresh coding-agent session could read and be immediately productive with. Include: a one-line description; the stack/versions that matter; the exact build, test (including how to run a single test), lint, and run commands; the directory layout worth knowing on day one; the conventions you've learned I follow here; and an Always/Never list of the gotchas and decisions we hit — especially anything you got wrong earlier that I corrected. Under 200 lines, markdown headers and short bullets, concrete and verifiable, no history. Don't invent commands or paths — mark anything you're unsure of as TODO. No API keys, tokens, or secrets — reference env-var names instead. Write the file now, then create a symlink so Claude Code loads it: ln -s AGENTS.md CLAUDE.md
 
-> **B — state:** Now append a "## Current state" section to the bottom of AGENTS.md: what's built and working, what's in progress and exactly where it stands, decisions we made that aren't implemented yet, known bugs, and the next 3–5 concrete steps. 15 lines max, present tense, no history. Longer-term backlog goes in a separate ROADMAP.md.
+> **B — state:** Now append a "## Current state" section to the bottom of AGENTS.md: what's built and working, what's in progress and exactly where it stands, decisions we made that aren't implemented yet, known bugs, and the next 3–5 concrete steps. 15 lines max, present tense, no history. Anything longer-term than those next steps — backlog, someday ideas, deferred decisions — goes in a separate ROADMAP.md at the repo root; create it now if there's any such backlog to capture.
 
 > **C — secrets sweep:** Scan AGENTS.md and anything else you just wrote for secrets — API keys, tokens, passwords, account numbers, private URLs. Replace each with its env-var name and a note about where the real value lives.
 
@@ -167,7 +167,7 @@ continues the most recent conversation in that folder. Nothing lost.
 **Other rules:**
 - `/compact` is for mid-task context overflow only. Task finished = close-out ritual + `/exit`. Never compact to extend a finished chat — that's the old habit sneaking back.
 - `/memory` shows every CLAUDE.md and rules file loaded right now, and lets you browse what auto memory has saved. Auto memory lives in `~/.claude`, outside the repo — Gitea never backs it up — so promote anything important into CLAUDE.md.
-- When **Current state** stops fitting in ~15 lines, it's accumulating history. Prune it; history lives in the git log.
+- When **Current state** stops fitting in ~15 lines, it's accumulating history or backlog. Prune it: finished narrative lives in the git log, still-real longer-term items move to ROADMAP.md. Current state holds only what a session starting now would act on.
 - **AGENTS.md is the real file; CLAUDE.md is a symlink to it.** AGENTS.md is the cross-vendor standard (Cursor, Copilot, Codex, Gemini CLI, and the open-source harnesses read it); Claude Code reads only CLAUDE.md, so the symlink serves it the same file under its preferred name. Either name edits the same file — every "update CLAUDE.md" in this runbook lands in AGENTS.md. If you ever switch providers or run self-hosted agents, the repo is already in their native format.
 - **The portability principle, generalized:** knowledge lives in vendor-neutral files; vendor-named paths are symlinks into it. Root: AGENTS.md ← CLAUDE.md. Scoped guidance: docs/guides/*.md ← .claude/rules/*.md, indexed by one line each in AGENTS.md. To try a different provider, swap at a session boundary: run the close-out ritual, open the other tool, and it reads AGENTS.md + Current state and continues. The repo is brain-agnostic; sessions are visits. Full protocol: portability.md in the standards repo.