Model Config Sync

Re-validate this machine's model-routing configuration against the current official docs. Propose changes only — never apply an edit without explicit user confirmation.

1. Fetch https://code.claude.com/docs/llms.txt, then the current pages on model configuration, settings, subagents, advisor, and skills.
2. Read ~/.claude/settings.json, ~/.claude/agents/*.md, ~/.claude/rules/effort-escalation.md, and this skill file.
3. Verify against the docs just fetched (not memory):
   • every settings key still exists with the same semantics: model absent ⇒ plan Default applies; fallbackModel array; advisorModel; no persistent effortLevel
   • what default, best, fable, opus, sonnet, haiku currently resolve to for this account, and that the fallback chain still steps one tier down per entry within the documented chain-length cap
   • subagent frontmatter is still valid (model: fable, tools), and whether a higher-tier alias now exists or best became valid in frontmatter
   • advisor pairing rules still accept the configured advisor for the models in use, and whether an advisor fallback chain has become a documented feature
   • no versioned model ID has crept into any of these files
   • extended-context defaults: whether any [1m] suffix became necessary or redundant
4. Report a table — item, current value, docs say, action needed — then show proposed file diffs and wait for approval before editing anything.

Recommended cadence: after every claude update that changes the minor version, or monthly.