## Summary
Fixes `fabro-sh/fabro#330` by making template partials that reference
missing inputs validate structurally with a warning instead of failing
the validate command. The template crate now owns MiniJinja semantic
error classification and source-location mapping, so workflow
diagnostics can consume already-resolved template locations instead of
remapping fragment spans itself.
## What Changed
- Added `TemplateErrorLocation` and `TemplateSourceOrigin` APIs to
report source name, line, column, and span from `fabro-template`.
- Classified wrapped MiniJinja errors by their deepest semantic cause,
preserving the original source chain for renderer context.
- Added fragment-origin rendering paths so attribute fragments embedded
in full workflow source report locations in the original source text.
- Removed workflow-side source span remapping from template diagnostics;
workflow now only adds owner, node/edge, severity, rule, and fix
context.
- Added regression coverage for include/import/from/extends undefined
variables and the CLI `fabro validate` partial fixture.
## Test Plan
- `cargo nextest run -p fabro-template`
- `cargo nextest run -p fabro-workflow transforms::variable_expansion
transforms::file_inlining`
- `cargo nextest run -p fabro-cli --test it cmd::validate`
- `cargo +nightly-2026-04-14 fmt --check --all`
- `cargo +nightly-2026-04-14 clippy -p fabro-template -p fabro-workflow
-p fabro-cli --all-targets -- -D warnings`
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