Ship the batch: undo, parallel subagents, lazy MCP, hot-reloaded skills; docs and CI/CD

Loop and ergonomics batch across Now/Next and Maintenance:
- /undo and /redo via pre-prompt file snapshots (snapshot.ts)
- task takes a tasks[] array and runs investigations concurrently (subagent.ts)
- lazy MCP tools: mcp_list/mcp_inspect/mcp_call meta-tools, eager opt-in (mcp.ts, config.ts)
- skill tool reads its list live so a mid-session install is callable next turn (skills.ts)
- tool-name lists (tool-kinds.ts) derived from a mutating() marker; gates previously ungated writes
- prune/session recovery path summarized, and step-back doom-loop primitive (step-back.ts)
- @file completion re-walks on a slow cooldown; estimateTokens and pricing labeled as estimates

Docs: README, CHANGELOG, docs/{mcp,architecture,development} updated to match.
CI/CD: bun install-store cache and concurrency gates on both workflows; release.yml now
composes file-based release notes via scripts/make-release-notes.ts and verifies every binary.

src/ui/transcript.ts

@@ -1,4 +1,5 @@
 import { TODO_MARK } from '../notebook';
+import { normalizeEditArgs } from '../tools';
 
 export type Line =
   | { key: string; kind: 'user'; text: string }
@@ -38,7 +39,8 @@ export function preview(input: unknown): string {
  * the transcript, beside the spinner while a call is in flight, and in the approval
  * prompt for any tool without a diff of its own.
  */
-export function toolDetail(name: string, input: unknown): string[] {
+export function toolDetail(name: string, rawInput: unknown): string[] {
+  const input = normalizeEditArgs(rawInput);
   if (input === null || typeof input !== 'object') return [];
   const o = input as Record<string, unknown>;
   const str = (k: string) => (typeof o[k] === 'string' ? (o[k] as string) : undefined);