Preserve unknown tool calls and original names; relax allowlist filtering and adjust stream handling

[CJackHwang]

Motivation

• Make tool-call parsing less strict so that unknown or differently-cased tool names are preserved and emitted rather than being suppressed by a local allow-list policy.
• Avoid prematurely treating buffered assistant text as a tool use in the Claude stream path.
• Align JS and Go stream/tool-sieve behavior so incremental deltas and final tool_calls are consistently emitted for unknown tools.

Description

• Removed allow-list enforcement from tool-call parsing and filtering so parsed calls are preserved even when availableToolNames is empty or doesn't include the parsed name, and original tool name casing is kept (changes in internal/util/* and internal/js/helpers/*).
• Changed incremental tool-call delta filtering logic to stop marking unknown names as blocked and to populate seenNames with the original parsed name (changes in internal/adapter/openai/handler_toolcall_format.go and internal/js/chat-stream/toolcall_policy.js).
• Updated the Claude stream runtime to stop parsing buffered text for tool calls while bufferToolContent is set, removing the preemptive ParseToolCalls detection that triggered early finalization (change in internal/adapter/claude/stream_runtime_core.go).
• Updated numerous tests to reflect the new behavior: unknown tool names are emitted as tool calls, original name casing is preserved, and stream finish reasons now report tool_calls where applicable (tests under internal/adapter/openai, internal/adapter/responses, internal/util, and tests/node).

Testing

• Ran Go unit tests with go test ./... covering modified packages (internal/util, internal/adapter/openai, internal/adapter/claude, etc.) and updated tests; all tests passed.
• Ran JS unit tests for the stream-tool-sieve with npm test/node test runner (tests under tests/node/stream-tool-sieve.test.js) and they passed.

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