Prepare v0.4.0 release

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Release preparation for v0.4.0. Only release metadata and docs are changed.

Changes

• Version: package.json and package-lock.json bumped from 0.3.0 to 0.4.0. The build identity reports notMyShell 0.4.0.
• CHANGELOG: finalized as ## [0.4.0] - 2026-09-26 and organized by feature (Added / Changed / Fixed / Known limitations).
  • Rich Git, /prompt views, Connector fade, and the Powerlevel10k prompt-leak fix had been appended to the released [0.3.0] section. They move to 0.4.0, and [0.3.0] is restored to the text shipped on master.
  • Shipped work that was missing is now listed: sticky headers, Gap Wide and fade colors, the P10k configurator handoff, zsh hook preservation, and the Esc fixes.
  • Known limitations: Configured-zsh completion parity and fzf-tab interoperability #52 completion/fzf-tab parity, notifications not included, the P10k left-prompt-only behavior, TAP-only nested activity, and /update apply's supported install method.
• README: covers the right-side prompt with placement and mirroring, show-on-command modules, width-aware path shortening, smart output folding with Smart/Never, and sticky headers.
• ROADMAP: the current release is v0.4.0, with a concise shipped-scope table (including Sticky command headers while scrolling the transcript #104 and Smart output folding preserves useful command results #113). Interaction layout modes: docked, flow, and chat presentation #79 interaction layout modes is the next design/research direction, with composer placement and transcript presentation as independent axes. Unscheduled issues (Configured-zsh completion parity and fzf-tab interoperability #52, Native parity with common zsh editor plugins #75, Optional shell-tool discovery and first-run setup #9, Custom user-defined prompt modules #73, Chroma: gradients, animated color treatments, and transient visual effects #78, Tool configuration center: read/edit supported tool config inside /settings #83–Interactive command/output block controls (Warp-like block actions) #85, Command completion notifications for long-running commands #106) move to a separate backlog.

Verification

npm run build, npm run typecheck, npm test (427/427), git diff --check, and node dist/index.js --version → notMyShell 0.4.0.