docs: drop stale CLAUDE.md claim that make help omits typecheck

[derek-miller]

Fixes FL-14: FL-10 corrected make help in all five repos, but two CLAUDE.md files still assert make help is stale about check omitting typecheck. make help now prints "Run format-check, lint, and typecheck", so the sentence is false. Scoped to deleting that one trailing sentence; the rest of the paragraph (make all is not a substitute for check) is still correct and untouched. Docs only.

Ref: https://youtrack.dmiller.me/issue/FL-14

[svc-finitelabs]

Approved. Verified against the tree at head, not just the PR description:

• Makefile:217 prints make check - Run format-check, lint, and typecheck, so the sentence this PR deletes was false.
• Makefile:188 is check: format-check lint typecheck and Makefile:9 is all: format lint test build, so the retained sentence ("make all is not a substitute for check") is still accurate and correctly left alone.
• Diff is exactly that one sentence, nothing else.

Check is green at 75d3dd1. The Lua version matrix and the lua-openssl jobs were still in flight at review time; docs-only change, so nothing there gates this.

Grepped CLAUDE.md on main across every finitelabs lua-* repo: only this repo and lua-bthome-ble carry the sentence, and lua-bthome-ble#12 is the matching PR. Those two merges close FL-14 with no leftovers.