[luongnv89]

Description

Adds an opt-in show_account option that displays the logged-in Claude account email after the model name, so users who switch between accounts can tell which one a session is running under:

context-stats | main [13] | $0.00 | Opus 5.5 | me@example.com | abc

• The email is read locally (no network) from oauthAccount.emailAddress in Claude Code's .claude.json: $CLAUDE_CONFIG_DIR/.claude.json when CLAUDE_CONFIG_DIR is set, else ~/.claude.json.
• Hidden automatically when there is no logged-in account (API-key auth) or the file is missing/unparseable. Non-printable characters are stripped so the value cannot inject terminal escapes.
• Off by default — the email is personal data that would otherwise leak into screenshots and screen shares. Enable with show_account=true; color via color_account (defaults to the dim separator color).
• The reader is single-sourced in _shared.py (vendored byte-identically to scripts/_statusline_shared.py); config key, color slot, and segment wired in both the package and the standalone script. New row added to the CLAUDE.md sync table.

Related Issue

None. (The CI Dependency Vulnerability Scan failure seen on this PR predates it; tracked in #202, fixed by #203.)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactoring (no functional changes)

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Python implementation produces correct output (if applicable)

Testing

• ruff check . and mypy src scripts clean
• pytest tests/python/ — 1553 passed, coverage 96.9% (floor 94%)
• New parity tests: reader edge-case grid, .claude.json path resolution (CLAUDE_CONFIG_DIR vs ~), byte-identical package/script render with the option on and off
• isolated_home fixture now clears CLAUDE_CONFIG_DIR so a developer's real account email can't leak into test renders
• Manually verified against a real CLAUDE_CONFIG_DIR profile via a pipx install from this branch

Decision Record

• Root cause: The status line shows no signal of which Claude account a session runs under, so users who switch accounts (e.g. via CLAUDE_CONFIG_DIR profiles) cannot tell them apart.
• Options considered: (1) read oauthAccount.emailAddress from Claude Code's local .claude.json; (2) query the account over the network; (3) show it by default vs. opt-in.
• Options rejected: Network lookup (violates the project's no-network rule and adds latency to every render); default-on display (the email is personal data that would leak into screenshots and screen shares).
• Selected option: Opt-in show_account (default off) reading $CLAUDE_CONFIG_DIR/.claude.json, else ~/.claude.json; non-printable characters stripped; reader single-sourced in _shared.py and vendored byte-identically to the standalone script; color_account color slot.
• Residual risk: .claude.json is re-parsed on every render when enabled (measured ~0.4–3.8 ms on a 611 KB file); relies on Claude Code's undocumented oauthAccount field, which hides gracefully if the shape changes.