fix: stop reasoning-only loops for GLM/minimax

[marius-kilocode]

Problem

Some models (reported with z-ai/glm-4.7:free and minimax/minimax-m2.1:free) can stream only reasoning (<think>/reasoning deltas) and finish the step with finish: \"unknown\". SessionPrompt.loop keeps looping on unknown, causing an infinite repetition.

Original issue: #104

Fix

• Add a dedicated MessageReasoningStuckError.
• In SessionProcessor, track whether a step produced any non-reasoning output (text/tool parts).
• If a step is reasoning-only and exceeds a threshold (or finishes with unknown), mark the message with MessageReasoningStuckError and stop the loop.
• Format the error nicely in the CLI.

Tests

• bun run typecheck
• bun test (packages/opencode)

Closes #104

[kiloconnect]

Code Review Summary

Status: 2 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	1
SUGGESTION	1

Issue Details (click to expand)

WARNING

File	Line	Issue
packages/opencode/src/session/processor.ts	66	Abort forwarding listener can leak across loop iterations

SUGGESTION

File	Line	Issue
packages/opencode/src/cli/error.ts	45	Reasoning-stuck formatting ignores error's data.message

Other Observations (not in diff)

Issues found in unchanged code that cannot receive inline comments:

File	Line	Issue
packages/opencode/src/session/processor.ts	N/A	Existing inline comments already cover heuristic token-vs-char threshold + stream finalization/finish-gating; re-review after updates to avoid reintroducing loop/cleanup issues.

Files Reviewed (4 files)

• packages/opencode/src/cli/error.ts - 1 suggestion
• packages/opencode/src/session/message-v2.ts - 0 issues
• packages/opencode/src/session/processor.ts - 1 warning
• packages/sdk/js/src/v2/gen/types.gen.ts - 0 issues

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