Fix: opencode run --attach should pass auth headers from env vars

[hobostay]

Fixes #16096

Description

When using opencode run --attach=localhost:<port> with
OPENCODE_SERVER_USERNAME and OPENCODE_SERVER_PASSWORD env vars,
the command failed with "Error: Session not found".

The run command did not pass auth headers to createOpencodeClient,
while the attach TUI command correctly builds Basic auth headers from env vars.

Changes

Modified packages/opencode/src/cli/cmd/run.ts to:

• Read OPENCODE_SERVER_PASSWORD and OPENCODE_SERVER_USERNAME env vars
• Create Basic auth headers when password is provided
• Pass headers to createOpencodeClient

This matches the behavior of the attach TUI command in
packages/opencode/src/cli/cmd/tui/attach.ts.

[github-actions]

Hey! Your PR title Fix: opencode run --attach should pass auth headers from env vars doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

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Please edit this PR description to address the above within 2 hours, or it will be automatically closed.

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential duplicate found:

• PR fix(opencode): pass missing auth headers in run --attach #16097 - fix(opencode): pass missing auth headers in 'run --attach'
  fix(opencode): pass missing auth headers in run --attach #16097

This appears to be addressing the exact same issue as PR #16119. Both are fixing the opencode run --attach command to pass auth headers. The titles and scope are nearly identical, suggesting one may be a duplicate of the other.

[hobostay]

Closing as duplicate of #16097 which already fixes this issue with the correct title format.