docs: document minimumDependencyAge deno.json setting

[bartlomieju]

Summary

• Adds documentation for the minimumDependencyAge configuration field in the deno.json config page
• Covers all supported value formats: minutes, ISO 8601 duration, and RFC 3339 timestamps
• Documents CLI override via --minimum-dependency-age

Closes #3017

Test plan

• Verify the new section renders correctly on the configuration page
• Confirm code examples display properly

🤖 Generated with Claude Code

[petamoriken]

It looks like we might need to update last_modified manually.

[lunadogbot]

The --unstable-npm-lazy-caching claim in the caution block looks wrong. minimumDependencyAge is its own unstable feature (see denoland/deno#31007 — the introducing PR doesn't mention lazy caching), and the schema marks it (Unstable) on its own. unstable_npm_lazy_caching() in cli/args/mod.rs only gates eager-vs-lazy npm caching strategy and doesn't reference minimum_dependency_age. Suggest dropping the flag from the caution: "This feature is unstable. Configure it in deno.json or pass --minimum-dependency-age on the command line."

Also, the example uses "2025-09-16" (a date) but the prose calls it an "RFC 3339 timestamp" — the schema's own help text calls a bare date a "cutoff date" and a …T12:00:00+00:00 form a "cutoff time". Worth matching: "RFC 3339 date or timestamp".

• nit: #3046 and draft #3024 document the same field — coordinate with the maintainer on which lands.
• nit: last_modified: 2026-03-09 — #3002 should auto-bump this on build, so probably fine.

[bartlomieju]

Closing in favor of #3100, which covers minimumDependencyAge as part of the Deno 2.8 docs update.