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bobzhang 
feat(strconv): make trait promotions explicit via extend

Enable `implicit_impl_as_method` (E0079) for the `strconv` package (in its
moon.pkg) and make its trait-impl promotions explicit via `extend`, in a
dedicated strconv/extends.mbt shim.

Both Decimal and StrConvError have a genuine (non-deprecated) Show, so their Show
is split:
- Promote (plain `pub extend`): Decimal Show::{to_string}, StrConvError
  Show::{to_string}.
- Deprecate (`#deprecated(..., skip_current_package=true)` + `#doc(hidden)`):
  Decimal/StrConvError @debug.Debug and Show::{output}.

Decimal previously had a hand-written `fn Decimal::to_string(self) {
Show::to_string(self) }` that merely delegated to the trait; that redundant method
is removed in favour of the `pub extend Decimal with Show::{to_string}` promotion
(the public API is unchanged -- Decimal::to_string is still exposed).
pkg.generated.mbti gains Decimal::to_string and StrConvError::to_string.

Part of the per-package series (see #3849 for deque). Scoped to strconv/.

Verified: `moon check --deny-warn --target all` clean; `moon test -p strconv --target all` green.

Reviewed by Codex CLI: the extend-based refactor is behavior-preserving (public
Decimal::to_string unchanged), no E4056 remains, coverage/scope correct.

Signed-off-by: Codex CLI <codex@openai.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Source Files on job 5484.1