Closes the second open design decision on PR #103. The `/compact` finding was
recorded as a false positive needing an allowlist or a suppression mechanism.
It is neither: the routing universe is the apm marketplace, so a target either
resolves to a skill or an agent or it does not resolve, and `/compact`,
`/clear` and `/init` are Claude Code slash commands with no counterpart in
Copilot CLI or Codex. `.apm/` source compiles for all three, so a
vendor-neutral description routing to one is a portability defect and the hard
FAIL is a true positive.
An allowlist was rejected for a concrete reason, not a stylistic one: it
answers a different question ("does this exist on some host?"), it cannot
answer that portably from a single source file, and it goes stale the next
time a host ships a command — reintroducing the same-commit-two-verdicts
failure ADR-0020 already closed for deployed trees.
Nothing is blocked today: zero of the 43 descriptions name a host built-in,
and an author who needs to mention one writes it un-slashed, which is not
route notation and carries no routing claim.
Recorded in ADR-0020 and in both author-facing contract references, so the
next agent reads the decision rather than "fixing" the gate.
ADR: 0020
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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