Trim dor-cli.md back under its spec word budget

[dormouse-bot]

pnpm test on main fails at its first step since #780: docs/specs/dor-cli.md is at 6314 words against its 6300-word budget in scripts/spec-word-budgets.json (failed run). #780 added a four-line launcher exit-status rule to the spec. Its branch was based on #772, before the browser PRs (#773–#778) also edited this spec. Each branch was under budget on its own, but the merged result is not. Because pnpm test chains every step with &&, the other lints and package tests after spec-lint did not run on main either.

This trims the spec by 14 words instead of raising the budget. No rule is dropped:

• The new launcher rule keeps its bolded imperative, its one why-clause (scripts and dor await callers branch on the exit status), and its pointer to dor/test/launcher.test.mjs on the Windows standalone-platform-check leg.
• Two other passages are shortened. The host:port "pure string rewrite" sentence is reworded. Under ## Future, the "Additional dor list filters" item drops its redundant lead-in ("activity/state filters are deliberately deferred") and the word "possible", so it now just lists the deferred flags.

Locally, node scripts/spec-lint.mjs reports OK (35 specs, 69 files checked) and spec-lint-selftest passes. For both checks I added a placeholder standalone/sidecar/node_modules because this checkout has no installed dependencies. The other root-level lints in pnpm test also pass locally. The package tests are left to CI.

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[nedtwigg]

• fix in Remove draft PR policy from agent guidance and Argos #784