chore(tasks): wrap skill publish workflows

[szmyty]

Summary

• add a root Taskfile composition entrypoint using the organization-standard version: "3" + flattened include pattern
• add focused skills:build, skills:publish:dry-run, and skills:publish tasks
• require an explicit RELEASE_TAG before live publication
• always execute the dry-run path before the tagged publish wrapper
• delegate deterministic build behavior to ./aether distribution build
• delegate validation/publication behavior to the current gh skill publish command surface
• document Taskfile convenience commands and their direct-command equivalents
• add focused regression tests for composition, command ordering, tag gating, and secret-free Taskfiles

Command surface

task skills:build
task skills:publish:dry-run
task skills:publish RELEASE_TAG="v1.2.3"

Direct equivalents remain independently runnable:

./aether distribution build --output-directory "dist"
gh skill publish "dist" --dry-run
gh skill publish "dist" --tag "v1.2.3"

Architecture boundary

Taskfile is an optional developer-experience orchestration layer only. Aether remains the deterministic distribution implementation, GitHub CLI remains the skill publication implementation, and the protected release workflow remains the production release boundary. No credentials or release token values are stored in Taskfile configuration.

Validation

The complete Aether PR workflow is green after the final Task syntax/docs update:

• deterministic distribution build/check
• Aether validation and full tests, including tests/test_taskfile_workflows.py
• two-build byte reproducibility
• the repository's real gh skill publish "dist" --dry-run gate

Closes #46

[devactivity-app]

Pull Request Summary by devActivity

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