fix(lower): fn-value site lazily lowers winner only on resolver .none [0102d F1]

The bare-fn-as-value site (func_ref / fn-ptr / closure coercion) eagerly
lazily-lowered the name-keyed first-wins WINNER before the resolveBareCallee
block could reroute a genuine flat same-name collision to its per-source
author. Taking a SHADOW author's fn value therefore lowered (and could
mis-diagnose) the unused winner's body. Move lazyLowerFunction INSIDE blk_fv
onto the `.none` fallback only, mirroring the closure(fn) and free-function
UFCS sites: on `.func` use the resolved author's FuncId and never touch the
winner; on `.none` fall through to lazy-lower + resolveFuncByName the winner.

Regression: examples/0735-modules-flat-same-name-fn-value-winner — the
first-wins winner's body is independently broken and never used; a shadow
taken as a function value binds the shadow and runs (exit 0) while the winner
is not lowered. Fails-before (unresolved symbol in the winner), passes-after.

issues/0102-flat-import-same-signature-collision.md

@@ -60,7 +60,9 @@ collision:
      args fill from the RESOLVED author's defaults, not the winner's.
   2. **Function-value conversion** (`closure(fn)` and the bare-fn-as-value
      `func_ref` / fn-ptr / closure-coercion path): captures the resolved
-     author's FuncId.
+     author's FuncId. The winner's body is lazily lowered ONLY on the `.none`
+     fallback — a rerouted value never uses the winner, so taking a shadow as a
+     value must not pre-lower (and possibly mis-diagnose) the winner's body.
   3. **Free-function UFCS** (`recv.fn()` → `fn(recv, …)`): dispatches the
      resolved author for the receiver's source.
   4. **Comptime `#run`** of a bare call: `lowerMainAndComptime` now sets
@@ -71,7 +73,7 @@ collision:
 
 ## Regression tests
 
-`examples/0722`–`0734` (each a focused multi-file flat-collision scene that
+`examples/0722`–`0735` (each a focused multi-file flat-collision scene that
 fails on pre-fix code and passes after):
 
 - `0722-modules-flat-same-name-own` — own-author wins on the call path.
@@ -93,3 +95,8 @@ fails on pre-fix code and passes after):
   callee.
 - `0734-modules-flat-same-name-ufcs-ambiguous` — `≥2` flat authors, UFCS call
   → loud diagnostic (pre-fix: silently bound the winner).
+- `0735-modules-flat-same-name-fn-value-winner` — the first-wins winner's body
+  is independently broken and never used; a shadow taken as a function value
+  binds the shadow and runs while the winner is NOT lowered (pre-fix: the
+  fn-value site eagerly lowered the winner before the resolver rerouted,
+  surfacing the winner's error for a function the value never touches).