feat: add compressed SFS, shrink pipeline, multi-version Perl, and release workflow

[lbe]

The changes in this pull request were driven by my need to have as small of a WASM file as I could create to support go-exiftool-wasm, a Go package that is based upon translating WASM to native Go. I will be the first to admit that it is very large for a pull request. I did my best to approach your original package from an extend, not rewrite approach. I think was able to follow this approach except for needing to move from patch files to perl patch scripts to support various versions of perl without having to have a patch file per version.

A few points on the perl versions:

• While exiftool will run on perl versions back to 5.8, I was unable to get perl to compile to WASM for versions earlier that 5.16 without having to do some significant code changes.
• This code does support all version of perl from 5.16 - 5.42 except for 5.20 which also would require very large changes to compile to WASM.
• This pull release generates exiftool-5.42.2.wasm 14.6MB in size that is functionally equivalent to the upstream's 24.2MB file.
• The 5.16.3 version of just perl is 9.8MB. I was actually able to get it down to less that 7MB by stripping out more stdlib. I decided that 9.8MB compiled fast enough to stick with a full perl. In Go, it compiles in < 1 min whereas the 24.2MB version was taking over 20 mins. I add the actual exiftool source in as an embedded file system so that I can version it separately from perl.

I wll stop here, just short of War & Peace. I hope that this merge meets you acceptance. Please let me know if there is anything that I can do to help. LBE

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Multi-version Perl support (5.16.x and 5.42.x lines) with WASI cross-compilation, deterministic shrink pipeline, LZ4-compressed SFS embedding, and a matrix release workflow for generating variant WASM artifacts.

Pipeline & Docker

• Extend Dockerfile and build scripts for native prefix, shrink regen, prefix prep, wasm link (NO_MATHOMS/XS init, SFS compression, embed-prefix=false paths).
• Add build.sh orchestration script for local end-to-end builds.
• Refresh hints-wasi, prepare-prefix, build-wasm, build-exiftool, build-native-perl, build-wasi-libs.
• Add .dockerignore and root package.json for workspace tooling.

Shrink pipeline

• Add tools/regen-wasm-shrink.sh, tools/trace-zeroperl-deps.pl, tools/emit-wasm-xs-bundle.pl for traced dependency collection and deterministic shrink artifact generation.
• Add tools/wasm-shrink.env for tracer configuration.
• Replace glob.patch with more resilient patch_glob.pl; add patch_mg.pl, patch_iperlsys.pl, patch_sv_locale.pl for version-specific source fixes.
• Add tools/unicore-strip.pl, tools/file-glob-shim.pm, tools/perltidy-skip.txt, tools/extract-missing-paths.pl.
• Add tools/wasm-xs-kernel.txt, tools/check-wasm-shrink-determinism.sh.

SFS compression

• Rework tools/sfs.js for LZ4-framed entries with codec=0/1 per-file.
• Add stubs/sfs_runtime.c, stubs/sfs_compression.c, stubs/sfs_lz4.h, stubs/sfs_runtime.h, stubs/sfs_compression.h for lazy decompression with LRU cache (20 MB cap, 4096 entries).
• Wire ZEROPERL_SFS_COMPRESS through Dockerfile, prepare-prefix.sh, build-wasm.sh.

Smoke tests and verification

• Add tests/smoke/core-smoke.pl, tests/smoke/core-mod-smoke.pl, tests/smoke/lib/Core/TestMod.pm, and sample corpus (sample.jpg.b64, sample.tiff.b64, sample.xmp).
• Add tools/wasm-smoke.mjs, tools/wasm-smoke.sh, tools/verify-embedded-inc.mjs for embedded prefix verification.
• Add tests/sfs/test-generator.js, tests/sfs/test-sfs.c, tests/sfs/Makefile for native SFS unit tests.

CI and release

• Add zeroperl-release.yml: matrix builds 4 WASM variants in parallel (exiftool-5.16.3, exiftool-5.42.2, perl-only-5.16.3, perl-only-5.42.2) with full CI verification (shrink determinism, smoke tests, embedded @inc check) and publishes as a draft GitHub release.
• Remove zeroperl.yml (replaced by zeroperl-release.yml).
• Update nodefs workflow and Binaryen/WABT setup actions.
• Update all GitHub Actions to Node.js 24 compatible versions (checkout@v7, upload-artifact@v7, download-artifact@v8, action-gh-release@v3).

Submodules and repo hygiene

• Add zeroperl-ts git submodule; remove go-exiftool-wasm submodule.
• Remove test-matrix.sh, test-matrix-all.sh, run-failed-and-report.sh (depended on go-exiftool-wasm).
• Remove perl-delta-spec.md, .vscode/settings.json, check-fs.mjs.
• Update .gitignore; add gen/, output/, test-output/, tmp/ entries.

Docs

• Add comprehensive ARCHITECTURE.md covering build pipeline, runtime architecture, shrink modes, SFS compression, and CI verification.
• Revise README.md with build instructions, build arg reference, and submodule setup.