feat: removed normative rewrite experiment from public API and patch processing

- Removed normativeRewrite setting and buildNormativeUpdateInput() function from public API.
- Removed $normative property and TNormative generic parameter from ToolResultMessage and AgentToolResult interfaces.
- Deleted normative.ts patch normalization module and related helper functions for diff anchor processing.
- Removed rewriteAssistantToolCallArgs() and #rewriteToolCallArgs() methods that modified tool call arguments.

packages/coding-agent/src/patch/normative.ts

@@ -1,72 +0,0 @@
-/**
- * Normalize applied patch output into a canonical edit tool payload.
- */
-import { generateUnifiedDiffString } from "./diff";
-import { normalizeToLF, stripBom } from "./normalize";
-import { parseHunks } from "./parser";
-import type { PatchInput } from "./types";
-
-export interface NormativePatchOptions {
-	path: string;
-	rename?: string;
-	oldContent: string;
-	newContent: string;
-	contextLines?: number;
-	anchor?: string | string[];
-}
-
-/** Normative patch input is the MongoDB-style update variant */
-
-function applyAnchors(diff: string, anchors: Array<string | undefined> | undefined): string {
-	if (!anchors || anchors.length === 0) {
-		return diff;
-	}
-	const lines = diff.split("\n");
-	let anchorIndex = 0;
-	for (let i = 0; i < lines.length; i++) {
-		if (!lines[i].startsWith("@@")) continue;
-		const anchor = anchors[anchorIndex];
-		if (anchor !== undefined) {
-			lines[i] = anchor.trim().length === 0 ? "@@" : `@@ ${anchor}`;
-		}
-		anchorIndex++;
-	}
-	return lines.join("\n");
-}
-
-function deriveAnchors(diff: string): Array<string | undefined> {
-	const hunks = parseHunks(diff);
-	return hunks.map(hunk => {
-		if (hunk.oldLines.length === 0 || hunk.newLines.length === 0) {
-			return undefined;
-		}
-		const newLines = new Set(hunk.newLines);
-		for (const line of hunk.oldLines) {
-			const trimmed = line.trim();
-			if (trimmed.length === 0) continue;
-			if (!/[A-Za-z0-9_]/.test(trimmed)) continue;
-			if (newLines.has(line)) {
-				return trimmed;
-			}
-		}
-		return undefined;
-	});
-}
-
-export function buildNormativeUpdateInput(options: NormativePatchOptions): PatchInput {
-	const normalizedOld = normalizeToLF(stripBom(options.oldContent).text);
-	const normalizedNew = normalizeToLF(stripBom(options.newContent).text);
-	const diffResult = generateUnifiedDiffString(normalizedOld, normalizedNew, options.contextLines ?? 3);
-	let anchors: Array<string | undefined> | undefined =
-		typeof options.anchor === "string" ? [options.anchor] : options.anchor;
-	if (!anchors) {
-		anchors = deriveAnchors(diffResult.diff);
-	}
-	const diff = applyAnchors(diffResult.diff, anchors);
-	return {
-		path: options.path,
-		op: "update",
-		rename: options.rename,
-		diff,
-	};
-}