feat(cli): expose --dangerously-skip-permissions as a top-level flag

[YumaKakuya]

Issue for this PR

Follow-up to #21266 (no separate issue filed).

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

#21266 added --dangerously-skip-permissions as an opencode run flag. When opencode is started as a TUI session (top-level CLI), the flag is unavailable, so users have to configure per-agent permission overrides to get the same auto-accept behaviour.

This PR exposes the same flag at the top-level CLI so one flag covers both opencode run and TUI sessions. Setting OPENCODE_DANGEROUSLY_SKIP_PERMISSIONS=1 (or passing --dangerously-skip-permissions) makes Permission.ask() return early, so every tool call skips the prompt loop.

Three small additions:

• packages/opencode/src/index.ts — top-level .option("dangerously-skip-permissions", ...) and a middleware line that pipes the arg into process.env.OPENCODE_DANGEROUSLY_SKIP_PERMISSIONS.
• packages/opencode/src/flag/flag.ts — dynamic getter for OPENCODE_DANGEROUSLY_SKIP_PERMISSIONS using the same access-time evaluation pattern as the existing OPENCODE_PURE getter (the CLI sets the env var at runtime, so it must not be evaluated at module load).
• packages/opencode/src/permission/index.ts — Permission.ask() early-return when the flag is set.

opencode run is untouched — #21266 still owns that path.

How did you verify your code works?

• Ran a local TUI session with OPENCODE_DANGEROUSLY_SKIP_PERMISSIONS=1 and confirmed tool permission prompts no longer appear and the session runs without manual approval. Without the flag, prompts behave normally.
• Ran opencode run --dangerously-skip-permissions "..." before and after the change to confirm feat: add --dangerously-skip-permissions flag to opencode run #21266 semantics are unchanged.
• No new tests added. Happy to add coverage for the early-return path in permission/index.ts or for the middleware env plumb if a maintainer wants it.

Screenshots / recordings

N/A — behavioural change only, no UI.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

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

Based on my search, I found one potentially related PR:

PR #7137: feat: add --dangerously-skip-permissions flag
#7137

This appears to be an older PR that introduced the --dangerously-skip-permissions flag, while the current PR (#22047) is a follow-up that exposes it as a top-level flag for TUI sessions. These are related but not duplicates—the current PR extends functionality introduced in the earlier PR.

[github-actions]

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