Bug: Effort badge 'L' is ambiguous in plan notebook — reads as 'Low' not 'Large'

[shakestzd]

Bug Report

Description: In the marimo plan review notebook, the effort badges use single-letter codes (S, M, L) without a legend. The "L" badge is easily misread as "Low" when it actually means "Large." This was caught during review of the Codex Interoperability plan (plan-31cd5de1) where Slice 6 (MCP server) showed Effort: L, Risk: High — the reviewer read "L" as "Low" and flagged the mismatch.

Environment

• HtmlGraph version: 0.46.1-17-g51273902
• OS: Darwin 25.4.0

Steps to Reproduce

1. Open any plan in the marimo review notebook
2. Look at a slice with effort: L
3. Read "L" as "Low" (natural first interpretation)

Expected Behavior

Badge meaning should be immediately clear without needing to consult documentation. A legend/key should be visible in the notebook template:

Effort: S = Small | M = Medium | L = Large
Risk:   Low | Med | High

Actual Behavior

No legend exists. "L" is ambiguous — could mean "Low" or "Large." The risk field uses full words (Low/Med/High) while effort uses single letters (S/M/L), making the inconsistency worse.

Suggested Fix

Add a legend to the marimo notebook plan review template, either as:

• A header row/caption near the slice cards
• A tooltip on hover over the badges
• A footer key at the bottom of the notebook

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Reported via HtmlGraph issue reporter