user 18226d345b WIP: fix export/override prefix and ?= first-wins in make variable parser ...

Two defects in the lint-once resolver's make variable handling:

- The assignment pattern anchored at the start of the name, so
  `export FMT := script/fmt-check` was never collected and `@$(FMT)`
  went unresolved. An optional `export `/`override ` prefix is now
  allowed.
- `?=` assigns only when the name is unset, so the first assignment
  wins. The parser called .set() unconditionally, letting a later
  `FMT ?= script/build` overwrite an earlier `FMT := script/fmt-check`
  and resolve to a command make never runs.

Tests pinning both to follow.

2026-09-04 11:17:32 +00:00

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