fix(claude): restore canonical tool names so Claude Code accepts tool calls

[linhdmn]

⚠️ base-red inherited: #9985 — Quality Gates / fast-path unit jobs fail identically on unrelated PRs against release/v3.8.50; failures are not from this branch (see live-validation comment below).

Problem

Claude Code clients routed through OmniRoute to OpenAI-compatible providers lose native tool calls entirely. Live reproduction (2026-08-22, opencode-go/ox-alpha-free upstream, /v1/messages with 143 declared tools):

1. The model emits a tool call for the Bash tool, but the name reaches the client lowercased as bash.
2. Claude Code validates tool names case-sensitively and rejects it:

<tool_use_error>Error: No such tool available: bash</tool_use_error>

Every retry fails the same way — Bash/Read/Write/CronCreate stay dead for the whole session while MCP tools (which happen to be lowercase already) keep working.

Call logs show two distinct leaks:

• Non-streaming conversion never restored names. When an upstream answers a stream:true request with an application/json body, OmniRoute converts via translateNonStreamingResponse, whose convertOpenAINonStreamingToClaude copied function.name verbatim into the Claude tool_use block. The streaming path already called restoreClaudeToolName; the non-streaming path did not.
• Identity echoes pinned wrong casing. Some upstream gateways echo the very lowercase name they emitted back through the _toolNameMap alias channel (croncreate → croncreate). restoreClaudeToolName returned that identity match before considering canonical casing, and TOOL_RENAME_MAP was missing the cron-era tools (TaskCreate, TaskUpdate, TaskList, TaskGet), so even the canonical upgrade had nothing to upgrade to.

Fix

• open-sse/handlers/responseTranslator.ts: pass the request's toolNameMap into convertOpenAINonStreamingToClaude and restore each emitted tool name via restoreClaudeToolName, matching the streaming translator.
• open-sse/services/claudeCodeToolRemapper.ts:
  • Known Claude Code tools are upgraded to canonical PascalCase even when a map entry matches identically (bash → Bash, croncreate → CronCreate, …).
  • Added missing cron-era entries to TOOL_RENAME_MAP: TaskCreate, TaskUpdate, TaskList, TaskGet.
  • Preference order documented; real request-side aliases still win over canonical casing (read → mcp__fs__read is preserved), and the #7926 no-map TitleCase→lowercase fallback is untouched.

Tests

New suite tests/unit/claude-code-tool-casing-identity-echo.test.ts (12 cases):

• identity-echo / cloak-direction / mixed maps all upgrade echoed lowercase names (incl. live-repro bash → Bash and cron-era tools) in both restoreClaudeToolName and the streaming openaiToClaudeResponse
• translateNonStreamingResponse upgrades bash → Bash with no map (live repro) and honours aliases/canonical order
• regression guards: non-identity alias beats canonical, unknown custom names preserved verbatim, #7926 fallback unchanged

All green together with the existing suites: gemini-to-claude-tool-name-case-9008, claude-tool-name-casing-fix, claude-code-tool-remapper-flag-leak, provider-request-capture-toolname-map-4091, claude-server-tool-name-preserve, translator-resp-openai-to-claude, translator-openai-to-claude, claude-code-parity, xai-translators, 9568-gemini-tool-casing-mismatch (172 tests).

[linhdmn]

Live-environment validation (Hard Rule #18) — extended fix in 52af7f5

The original commits fixed lowercase echoes through alias maps, but a live test against a real upstream exposed a remaining gap on the most common route: Claude Code → OpenAI-style upstream ships no _toolNameMap, so an upstream echoing the canonical TitleCase fell through to the #7926 REVERSE_MAP fallback and was downcased (CronCreate → croncreate) — exactly the 'No such tool available' failure this PR targets.

Live repro (before 52af7f5) — real glm-5.2-high via opencode-go, isolated DATA_DIR, port 20129:

POST /v1/messages {model: opencode-go/glm-5.2-high, tools:[Bash, CronCreate], tool_choice:{type:tool,name:CronCreate}}
→ HTTP 200, tool_use.name = croncreate   ❌ (Claude Code would reject)

After 52af7f5 (canonical echo terminal after the alias-map block):

Same request → HTTP 200, tool_use.name = CronCreate   ✅
Natural-choice variant (no tool_choice) → tool_use.name = CronCreate   ✅

TDD: failing tests added first (canonical echo stays canonical on no-map routes, declared-lowercase alias preservation), then the minimal fix. All suites green locally: identity-echo 14/14, tool-name sweep 97/97 + 89/89, translator suites 30/30 + 63/63, claude-code regression 73/73; lint clean; typecheck:core clean.

Legacy OpenCode/XML-style lowercase clients remain protected via explicit alias maps ({Read→read}), which restore honors before the canonical-echo terminal.