chore(release): one changelog hook, with the full history

[scarmuega]

Summary

The v0.24.0 release left the worktree dirty and wrote an empty changelog section. This PR fixes both for future releases.

• Stray changelogs. release.toml set a workspace-wide pre-release-hook. cargo-release runs it once per crate, from that crate's directory, so git cliff -o CHANGELOG.md wrote untracked CHANGELOG.md files into bin/tx3c, crates/tx3-cardano and crates/tx3-resolver. The workspace hook is removed. The single hook in crates/tx3-lang writes the root CHANGELOG.md.
• Empty changelogs. git-cliff 2.10.1, run inside this repo as a git submodule, limits itself to a wrongly resolved "current directory" and drops every commit. That is why the 0.23.0 and 0.24.0 sections were empty. git-cliff 2.14.2 fixes this, in fix(args): resolve --workdir to a repo-relative include path orhun/git-cliff#1627. The hook now passes --include-path '**/*', so older versions produce the full history too.
• Tag format. The hook's --tag now uses the v prefix, matching tag-name = "v{{version}}".

Verification

I ran the new hook exactly as cargo-release would, from crates/tx3-lang with WORKSPACE_ROOT set:

• It regenerated the full root changelog, 224 entries, identical to the corrected v0.24.0 CHANGELOG.md.
• It wrote no files outside the root CHANGELOG.md.
• cargo release config shows no workspace hook, and cargo metadata parses.

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