Per-component tag-triggered releases

[nsheff]

Switches releases from a single monolithic GitHub Release (which fanned out and re-published every component) to per-component releases: each component publishes only when its own <package>-v<version> release tag is cut.

How it works

• Each job in rust-publish.yml is gated on startsWith(github.event.release.tag_name, 'gtars-<pkg>-v').
• The tag prefix is the exact workspace package name (no shorthand): gtars-python-v* → PyPI, gtars-r-v* → R binary, gtars-cli-v* → crates.io + CLI binaries, gtars-wasm-v*/gtars-node-v* → npm, gtars-<crate>-v* / gtars-v* → crates.io.
• The -v delimiter keeps gtars-v* (meta crate) from colliding with gtars-core-v* etc.

Changes

• Bindings decoupled from crates.io — dropped needs: publish-all-crates from python/cli; they build from source (path deps), so there's no dependency cascade.
• New publish-crate job — on a release, strips -v<version> from the tag and publishes that single crate (skips pure bindings; dependencies must already be on crates.io, so cut crate releases in dependency order).
• Retired the fanout — publish-all-crates is now manual-workflow_dispatch only (emergency "republish everything"); the create-tags job (force-pushed py-/r- shorthand tags) is removed.
• Docs — added RELEASING.md and a brief note in the README; also fixed a stale gtars-py → gtars-python reference.

Normal flow: bump the component version, merge, then releasegh a release named <package>-v<version>.

Verification

• rust-publish.yml YAML validated; tag→crate parsing and the gtars-v disambiguation unit-tested locally.
• Reusable workflows only trigger via workflow_call/workflow_dispatch, so rust-publish.yml stays the sole release entry point.
• Not yet exercised against a live release (would need an actual release cut).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.47%. Comparing base (90042fd) to head (5dae5c3).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #266      +/-   ##
==========================================
- Coverage   82.50%   82.47%   -0.03%     
==========================================
  Files          95       95              
  Lines       26786    26786              
==========================================
- Hits        22100    22092       -8     
- Misses       4686     4694       +8     

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