fix: simplify changelog Liquid templates

[any-victor]

Summary

• replace the over-engineered {% liquid %} echo programs with the original compact template style
• add only three deliberate breaks to the long release expression for breathing room
• simplify dependency rendering to a direct four-line loop with no empty separator block
• preserve rendered output byte-for-byte

Verification

• focused template tests: 4 passed
• direct comparison with the pre-echo templates: 5 release cases and 2 dependency cases identical
• mise run verify: 113 passed, 1 host-only skip
• pre-push lockfile, verify, and version guards passed

Release

No Changeset. Rendered changelog output and the published package are unchanged.