`fix` command bypasses the workflow layer and silently ignores `--mode`

[mayashavin]

Problem

src/cli/commands/fix.ts violates the project's CLI architecture rule: "CLI commands must not contain business logic."

1. It directly calls parseMarkdownTool, reviewSeoTool, and updateFrontmatterTool instead of delegating to a workflow (lines 25–33).
2. It accepts --mode light|medium|strong (line 16) but never passes it anywhere — the writing review (reviewWritingTool) is never called, so fix only surfaces SEO critical suggestions, never grammar/writing fixes.

Expected behaviour

• A fixDraftWorkflow should be created under src/workflows/fixDraftWorkflow.ts that composes parseMarkdownTool, reviewSeoTool, reviewWritingTool, and updateFrontmatterTool.
• The fix command should delegate to that workflow and pass --mode correctly.
• Writing suggestions marked with high confidence should be included in the diff output.

Files affected

• src/cli/commands/fix.ts
• src/workflows/ (new file needed)

References

• Architecture rule: CLAUDE.md — "CLI commands must not contain business logic."
• Plan §7.4 — fix command should show grammar/writing fixes.