Add /verify-all and /ci slash commands for comprehensive checks

[PAMulligan]

Summary

There is no single command to run all quality checks. Users must remember and run 10+ individual scripts. Two new slash commands would streamline this.

Proposed Commands

/verify-all

Runs all quality checks locally in sequence:

1. lint-and-format.sh
2. check-types.sh
3. run-tests.sh
4. check-accessibility.sh
5. verify-tokens.sh
6. check-dead-code.sh
7. check-security.sh
8. check-bundle-size.sh (if build output exists)

Reports pass/fail summary at the end.

/ci

Same as /verify-all but optimized for CI environments:

• Non-interactive (no prompts)
• JSON output mode for parsing
• Exit code reflects overall pass/fail
• Skips checks that require running dev server

Acceptance Criteria

• /verify-all command created in .claude/commands/
• /ci command created in .claude/commands/
• Both commands report summary with pass/fail per check
• /ci returns non-zero exit on any failure