Add /roundup cross-project status command

Fans out a read-only reader per repo over AGENTS.md/ROADMAP.md, folds in the
standards inbox, and synthesizes one priority-grouped to-do list across all
projects (including untriaged inbox items and proposed new projects). Reads and
reports only — prioritizing across projects stays with the user.

adapters/claude/commands/roundup.md

@@ -0,0 +1,20 @@
+---
+description: Cross-project status roundup — read every repo's AGENTS.md/ROADMAP.md plus the inbox and compile one priority-grouped to-do list across all projects
+argument-hint: [optional focus, e.g. "only P0/P1" or a subset of repos]
+allowed-tools: Bash, Read, Grep, Glob, Agent, Write
+---
+
+Produce a portfolio-wide status roundup across all my projects under `~/Projects`.
+Optional focus from me (may be empty): $ARGUMENTS
+
+Your complete orchestration guide — how to discover repos, the read-only reader you fan out
+per repo, the inbox pass, and the report format — is at:
+
+    ~/Projects/standards/guides/roundup.md
+
+Read it in full first, then follow it exactly. If you cannot read that file, stop and report
+precisely that — do not improvise the roundup.
+
+Read and report only: gather and group by the priorities you find, but do not rank the
+projects against each other or tell me what to work on — deciding the best use of time is
+mine. After you present the report, help me reason about ordering only if I ask.