[codex] Refresh real TUI assets for v0.4.1

[luoyuctl]

Summary

• refresh README GIF/screenshots from a real local agenttrace TUI run against discovered local sessions, not demo data
• bump release surfaces to v0.4.1 across CLI, README badges, Homebrew, npm, site metadata, demo report, and changelog
• update README real-run metrics from the latest local overview output

Validation

• test -z "$(gofmt -l .)"
• go vet ./...
• go test ./...
• go build -o /tmp/agenttrace ./cmd/agenttrace
• /tmp/agenttrace --version
• /tmp/agenttrace --doctor
• /tmp/agenttrace --overview -f json
• VHS real TUI recording with visible startup command agenttrace, full-screen color output, and real local session logs
• Full TUI workflow verification recording: /tmp/agenttrace-tui-full-verify.gif
• /bin/bash scripts/ci/check-output-contract.sh
• AGENTTRACE_BIN=/tmp/agenttrace AGENTTRACE_CI_OUT=/tmp/agenttrace-ci /bin/bash scripts/ci/check-deterministic-output.sh
• AGENTTRACE_BIN=/tmp/agenttrace AGENTTRACE_CI_OUT=/tmp/agenttrace-ci /bin/bash scripts/ci/check-report-semantics.sh
• /bin/bash scripts/ci/check-release-surfaces.sh
• AGENTTRACE_BIN=/tmp/agenttrace AGENTTRACE_CI_OUT=/tmp/agenttrace-ci /bin/bash scripts/ci/check-docs-commands.sh
• /bin/bash scripts/ci/check-pages-artifact.sh site
• node --check npm/install.js && node --check npm/run.js
• (cd npm && npm pack --dry-run)
• ruby -c homebrew/Formula/agenttrace.rb

Notes

The local machine has NO_COLOR=1, so the recording environment unsets it before launching the TUI. The visible startup command in the recording remains only agenttrace.