fix(crate): allowlist package contents to fit crates.io size cap (#152)

cargo publish of 0.1.5 failed with 413: the crate packaged everything
(260 files, 10.1MiB compressed) and tests/fixtures alone is 10.2MB.
Add an explicit include list (src, external/bcmaps which tounicode.rs
loads at runtime, readme, license) — 1.3MiB compressed.

Also add a workflow_dispatch fallback to publish-crate.yml so a failed
publish can be retried without a version bump (0.1.5 is already on
main, so a re-push won't register as a version change).

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Cargo.toml

@@ -8,6 +8,15 @@ description = "Fast PDF inspection, classification, and text extraction with sma
 license = "MIT"
 repository = "https://github.com/firecrawl/pdf-inspector"
 readme = "docs/rust-api.md"
+# Explicit allowlist: crates.io caps uploads at 10 MiB and tests/fixtures
+# alone exceeds that. external/bcmaps ships in the crate — tounicode.rs
+# loads it at runtime relative to CARGO_MANIFEST_DIR.
+include = [
+    "src/**",
+    "external/bcmaps/**",
+    "docs/rust-api.md",
+    "LICENSE",
+]
 
 [lib]
 name = "pdf_inspector"