feat(coding-agent): added auto-rebase for stale atom/hashline anchors

- Added auto-rebasing for stale atom and hashline anchors within ±2 lines, with warning diagnostics.
- Removed atom range-locator support and dropped `between` ops, updating docs/tests for `sub` over `set` nudges.
- Changed no-op handling to track unchanged hashline edits and emit contextual hints for unchanged ranges.
- Expanded Anthropic strict error handling to retry on schema-too-complex and compiled-grammar-too-large errors.
- Added anchor-retargeting warning checks and updated edit tests to expect locator and range-locator rejections.
- Updated python tool-call fixtures by adding `title` to executed-cell payloads and adjusting related test expectations.

packages/coding-agent/test/edit-diff.test.ts

@@ -372,7 +372,7 @@ describe("computeHashlineDiff", () => {
 		await Bun.write(sourcePath, "first\n");
 
 		const result = await computeHashlineDiff(
-			{ path: sourcePath, edits: [{ path: sourcePath, loc: "append", content: "second" }] },
+			{ path: sourcePath, edits: [{ path: sourcePath, loc: "append", content: ["second"] }] },
 			tempDir,
 		);
 		expect("diff" in result).toBe(true);