fix(anthropic): stop retrying content-filter refusals

[KooshaPari]

User description

Semantic upstream reconciliation of tailcallhq/forgecode commit b8ac475 (tailcallhq#3640).

Anthropic stop_reason: refusal now parses, maps to ContentFilter, and terminates as a non-retryable domain error when no tool calls exist.

Verification:

• cargo test -p forge_app message_delta_refusal_stop_reason --lib
• cargo test -p forge_app refusal_maps_to_content_filter --lib
• cargo test -p forge_domain into_full_refusal_is_non_retryable_error --lib
• cargo test -p forge_domain result_stream_ext::tests --lib
• rustfmt and diff checks

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CodeAnt-AI Description

Stop retrying Anthropic refusals and explain how to recover

What Changed

• Anthropic refusal responses are recognized and reported separately from normal content-filter completions
• Refusals without tool calls now end immediately with guidance to rephrase the request or use another model
• Existing content-filter completions with no text continue to complete normally

Impact

✅ Fewer repeated requests for refused prompts
✅ Clearer safety-filter guidance
✅ Correct handling of Anthropic refusal responses

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🤖 CodeAnt AI — Review Status

Status	Commit	Started (UTC)	Finished (UTC)
✅ Incremental review completed	87c5504	Aug 15, 2026 · 14:32	14:33
✅ Incremental review completed	3f1d0d2	Aug 14, 2026 · 08:08	08:09
✅ Reviewed your PR	2865c53	Aug 13, 2026 · 11:58	12:01

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[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• crates/forge_app/src/dto/anthropic/response.rs
• crates/forge_domain/src/message.rs
• crates/forge_domain/src/result_stream_ext.rs

Previous Review Summary (commit 2865c53)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 2865c53)

Status: 1 Warning Found | Recommendation: Address before merge

Overview

Severity	Count
WARNING	1

Issue Details (click to expand)

WARNING

File	Line	Issue
crates/forge_domain/src/result_stream_ext.rs	262	Anthropic-specific refusal logic applied globally to all providers

Files Reviewed (3 files)

• crates/forge_app/src/dto/anthropic/response.rs
• crates/forge_domain/src/error.rs
• crates/forge_domain/src/result_stream_ext.rs - 1 warning

Fix these issues in Kilo Cloud

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_{Reviewed by step-3.7-flash · Input: 67.1K · Output: 9.3K · Cached: 725.8K}

[KooshaPari]

Closing as empty mergify config duplicate (the same mergify config update was already merged to main in tailcallhq#3834, tailcallhq#3829, tailcallhq#3817, etc.). This PR has 0 file changes — mergify auto-respawned its housekeeping branch post-merge.

[KooshaPari]

Reopening — I accidentally closed this in a bulk-cleanup pass that was targeting a different mergify duplicate. This is a real Anthropic-related fix and should not have been closed. Apologies for the churn.

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[KooshaPari]

Superseded by #166.

main advanced to the v2.13.21 sync and now already contains the generic no-retry refusal fix. #166 preserves only the valid provider-scoped semantic delta on a fresh, non-force branch, with focused tests. This PR branch is intentionally retained as provenance evidence.

Co-Authored-By: ForgeCode noreply@forgecode.dev

[KooshaPari]

Closed as superseded by #166; branch retained.