fix(taskctl): hardcoded repo 'randomm/opencode' in executeStart causes wrong issue fetch

[randomm]

Bug

taskctl start <issueNumber> hardcodes const repo = "randomm/opencode" in job-commands.ts line 120. When running the opencode binary in a different project (e.g., sammas), it fetches issue content from randomm/opencode instead of the actual repo, causing the Composer to generate wrong tasks.

Root cause

packages/opencode/src/tasks/job-commands.ts line 120:

const repo = "randomm/opencode"

Fix

Detect the repo from git remote of cwd:

const remoteResult = await $`git remote get-url origin`.cwd(cwd).quiet().nothrow()
const remoteUrl = new TextDecoder().decode(remoteResult.stdout).trim()
// parse github.com/owner/repo from SSH or HTTPS remote URL
const repo = parseGithubRepo(remoteUrl) ?? "randomm/opencode"

Parse both formats:

• git@github.com:owner/repo.git → owner/repo
• https://github.com/owner/repo.git → owner/repo

Acceptance Criteria

• taskctl start fetches the issue from the repo where the binary is running, not a hardcoded value
• Falls back gracefully if remote detection fails
• Existing tests pass

Quality Gates

• TDD: tests before implementation
• Linting passes
• Local verification: all tests pass