chore(harness): adds skill for linear issue creation via mix lc

[bougyman]

Summary

• Add a repository-shared Linear CLI skill with body-file-based issue creation,
  explicit assignment/status handling, labels, and dependency verification.
• Add issue create --no-take so automated issue creation can remain
  unassigned unless the requester explicitly chooses an assignee.
• Split the fast local mix precommit gate from the complete mix ci gate:
  local root and app tests exclude ci_only, while CI runs both suites without
  test selection.

Validation

• cd app && mix test test/linear_cli/cli/issue_commands_test.exs

[Copilot]

🟡 Changes recommended

The Linear skill has unresolved label and self-assignment behavior issues, and the quality-gate change needs documentation.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

Adds a Linear issue-management skill via mix lc and separates local precommit coverage from complete CI coverage.

Changes:

• Adds Linear issue creation and workflow guidance.
• Excludes ci_only tests from mix precommit.
• Runs complete root and application suites in mix ci.
• Updates related tests and documentation.

File summaries

File	Summary	Review findings
test/mix/tasks/precommit_test.exs	Verifies local test selection.	—
test/mix/tasks/ci_test.exs	Verifies complete CI test runs.	—
test/git_hooks_test.exs	Marks hook tests as CI-only.	—
lib/mix/tasks/precommit.ex	Excludes CI-only tests locally.	Nit (1 vote): document the quality-gate behavior change.
lib/mix/tasks/ci.ex	Runs complete root and application suites.	—
documents/quality-gates-decision.adoc	Documents updated gate behavior.	—
.ai/skills/linear-cli/SKILL.md	Adds Linear issue workflow guidance.	Moderate (3 votes): requested labels are not passed or applied. Moderate (1 vote): --yes triggers self-assignment even when no assignee was requested.

Review details

Suppressed comments (3)

.ai/skills/linear-cli/SKILL.md:39

• --yes is not only a prompt-suppression flag here: issue create automatically calls the self-assignment flow. This prescribed command therefore assigns every new issue to the current user even when no assignee was requested, while the later step has no way to preserve an unassigned issue. Use or add a CLI path that disables self-assignment, or document this behavior as a required part of the workflow.

   mix lc issue create --yes \
     --team TEAM \
     --project PROJECT \
     --title TITLE \
     --body-file BODY_FILE

.ai/skills/linear-cli/SKILL.md:46

• This post-create step only covers the case where both an assignee and a status were requested. If only a status is requested, there is no instruction to apply it; using issue assign without --assignee would prompt interactively. Document the separate issue status ISSUE_ID --status STATUS path and the assignee-only path, while retaining the combined command for requests that include both.

4. Capture the returned identifier. When the user specified an assignee and
   status, apply both explicitly:

   ```sh
   mix lc issue assign --assignee ASSIGNEE --status STATUS ISSUE_ID

lib/mix/tasks/precommit.ex:46

• The PR description only mentions adding the Linear issue skill, but this change also alters the quality gates: local root tests now exclude ci_only, and mix ci adds a full root test run. Please document this behavioral change or split it so the gate changes receive explicit review.

    shell.("mix", ["test", "--exclude", "ci_only"], [])

• Files reviewed: 9/9 changed files
• Comments generated: 1
• Review effort level: Lite

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