Make /roundup's tracked STATUS.md snapshot its default, committed output

Promote STATUS.md from an opt-in offer to standard behavior: every /roundup run now writes the report to ~/Projects/standards/STATUS.md (overwritten), shows it inline, and commits + pushes only that file so the portfolio state is diffable over time — the same durability reflex as /capture. STATUS.md remains the only file roundup writes; all project repos stay read-only. Updates guide (new Phase 4), wrapper, ROADMAP item 2, README, and Current state.

guides/roundup.md

@@ -42,13 +42,14 @@ existing one.
 Wait for all readers before synthesizing. If a reader fails or a repo has neither file, note
 it honestly rather than dropping the repo.
 
-## Phase 3 — Synthesize (one report)
+## Phase 3 — Synthesize (one report → STATUS.md + inline)
 
-Present ONE report in the chat. Default to showing it inline; if the user wants a tracked
-snapshot they can diff over time (like `EVALUATION.md`), offer to write it to
-`~/Projects/standards/STATUS.md` — their call, and don't commit it yourself.
+Produce ONE report. **Write it to `~/Projects/standards/STATUS.md`**, overwriting the
+previous snapshot, **and** show the same report inline in the chat — the file is the durable,
+diffable record; the inline copy is for reading right now. Title it with today's date (run
+`date +%F`).
 
-Structure:
+Structure (used identically for the file and the inline copy):
 
 ```
 # Roundup — <date>
@@ -73,9 +74,26 @@ The (new)/(new:name) inbox items — ideas awaiting the new-repo bootstrap.
 Repos missing AGENTS.md or a Current state; stale-looking states; anything that blocked a reader.
 ```
 
+## Phase 4 — Persist the snapshot
+
+`STATUS.md` is only a *tracked* snapshot if it's committed — that's the whole point of the
+file (a dated history you can diff over time). So after writing it, commit and push **only
+that file** to the standards repo, without asking (the same durability reflex as `/capture`):
+
+- `git -C ~/Projects/standards add STATUS.md`
+- `git -C ~/Projects/standards commit -m "Roundup snapshot — <date>" -- STATUS.md`
+  (the `-- STATUS.md` pathspec commits only the snapshot — never sweep unrelated standards
+  changes into a roundup commit)
+- `git -C ~/Projects/standards push` (only if a remote is configured; if the push fails,
+  report it but don't treat the snapshot as lost — it's committed locally)
+
+This write-and-commit of `STATUS.md` is the *only* thing `/roundup` changes on disk;
+everything else — every project repo, every other file — stays strictly read-only.
+
 ## Rules
 
-- Read-only. The only file you may write is `STATUS.md`, and only if the user asks for it.
+- The only file you may write or commit is `~/Projects/standards/STATUS.md` (the snapshot).
+  Every project repo and every other file stays strictly read-only — never edit or commit them.
 - Quote priorities and states as found; never re-rank projects or recommend what to do next
   unprompted — that's the user's call.
 - Preserve every item; if you can't place one, list it under "needs triage" rather than