docs: migrate remaining docs.claude.com URLs to code.claude.com

[kyle-sexton]

Summary

Anthropic moved the Claude Code documentation from docs.claude.com/en/docs/claude-code/<slug> to
code.claude.com/docs/en/<slug>. The old URLs currently 301-redirect, so nothing is broken yet
— but the repo should migrate while the redirect still works rather than after it is retired.

The bulk migration is already done: a repo-wide sweep finds 369 code.claude.com references
against 5 docs.claude.com stragglers, in 3 files.

docs/OFFICIAL-DOCS.md — this repo's canonical index of official pages — was checked and is
already fully migrated (51 code.claude.com hits, zero stale). No action needed there.

Stale instances

path:line	old URL	disposition
plugins/claude-ops/skills/known-issues/context/issue-templates.md:198	https://docs.claude.com/en/docs/claude-code	rewrite → https://code.claude.com/docs/en/overview
plugins/claude-ops/skills/known-issues/context/issue-templates.md:199	https://docs.claude.com/en/docs/claude-code/quickstart	rewrite → https://code.claude.com/docs/en/quickstart
plugins/claude-ops/skills/known-issues/context/issue-templates.md:200	https://docs.claude.com/en/docs/claude-code/troubleshooting	rewrite → https://code.claude.com/docs/en/troubleshooting
plugins/playbooks/skills/boris/reference/autonomy.md:78	https://docs.claude.com/en/docs/claude-code/settings	rewrite → https://code.claude.com/docs/en/settings
plugins/playbooks/skills/boris/vendor/SKILL.md:1129	https://docs.claude.com/en/docs/claude-code/settings	do not touch — verbatim upstream baseline kept for drift detection; any edit manufactures false drift

Verification

The path shape changes (/en/docs/claude-code/X → /docs/en/X), so a mechanical string swap is
not safe. Each rewritten URL was verified by fetching the old URL, observing the redirect, then
fetching the proposed target and confirming the topic:

• /settings — old 301s to code.claude.com/docs/en/settings; target is "Claude Code settings".
• /quickstart — old 301s to code.claude.com/docs/en/quickstart; target is "Quickstart".
• /troubleshooting — old 301s to code.claude.com/docs/en/troubleshooting; target is
  "Troubleshooting".
• The bare root https://docs.claude.com/en/docs/claude-code does not map like the others:
  it 302s to platform.claude.com/docs/en/claude-code, then 307s to code.claude.com/docs (the
  bare docs root, a different host from the other three). code.claude.com/docs/en/overview is
  therefore an inferred target rather than a redirect-verified one; it was fetched
  independently and confirmed to be the real Overview page, and it matches the repo's dominant
  /docs/en/<slug> convention.

Deferred

lychee.toml link-checks every markdown file including the vendored baseline, and its exclude
list has no claude.com entry. When Anthropic retires the 301, the weekly advisory link-check lane
will start filing a tracking issue for the vendored URL that cannot be fixed by editing the file.
The remedy is a lychee.toml exclude entry (or an exclude_path for the boris vendor/
directory) — but lychee.toml is a tool config materialized from melodic-software/standards, so
per AGENTS.md the fix belongs upstream, not as a local patch. Tracked here; not addressed in the
accompanying PR.