feat(add package): lektra

[mvanhorn]

Summary

Closes #1858.

Adds Lektra, a high-performance document and image viewer (PDF, images, etc.) that prioritizes screen space and control.

Package

• Source: GitHub Releases (dheerajshenoy/lektra)
• Asset pattern: lektra_<version>_<arch>.deb (the project ships a signed .deb per release)
• Architecture: amd64 (only architecture upstream currently publishes)
• Latest: lektra_0.7.1_amd64.deb from tag v0.7.0

Files changed

• 01-main/packages/lektra — new package definition using the standard get_github_releases "dheerajshenoy/lektra" "latest" pattern with HOST_ARCH matching.
• 01-main/manifest — added lektra alphabetically between lact and lens.

The VERSION_PUBLISHED parser uses basename ${URL} then cut -d _ -f 2 to read the deb file's actual version (0.7.1) rather than the git tag (v0.7.0). The two versions differ in this release because upstream bumps the deb packaging version independently.

Acceptance criteria

• Package is published authoritatively by the upstream maintainer (dheerajshenoy is the project owner).
• .deb asset, not source build or tarball.
• Stable release (v0.7.0 / 0.7.1, not pre-release).
• Dynamic version detection (parsed from deb asset name).
• Issue opened first (App Request: Lektra #1858, by another contributor).
• Bash syntax validated locally (bash -n).
• README.md not manually edited (per CONTRIBUTING).

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Auto-approved: Isolated addition of a new package using standard repository patterns and helper functions. Minimal risk and no impact on core system logic.}