fix: update METRIC_METADATA target display strings to match green zone threshold (>0.85) for context_precision and context_recall

[decko]

Summary

METRIC_METADATA in src/raki/report/html_report.py:180 still shows 'Target: >0.80' as the display string for context_precision and context_recall, while the color zone green threshold was updated to 0.85 in PR #350. This mismatch can confuse users who see a score of e.g. 0.82 rendered as yellow/amber in the report while the tooltip says the target is >0.80.

Details

• File: src/raki/report/html_report.py:180
• Affected metrics: context_precision, context_recall
• Current display string: 'Target: >0.80'
• Current green zone threshold: 0.85
• A score of 0.82 satisfies the displayed target but is still rendered in yellow/amber, which is contradictory from a UX standpoint.

Suggested Fix

Either:

1. Update the target display strings from '>0.80' to '>0.85' to match the color zone thresholds, or
2. Add clarifying UI copy (e.g., tooltip or legend) that distinguishes between the minimum acceptable target and the green zone threshold, if they are intentionally different concepts.

References

• Found during review of: fix(report): align CLI and HTML score color thresholds at 0.85 #350
• Parent ticket: fix: align CLI and HTML score color thresholds to prevent green/yellow inconsistency at 0.80-0.85 boundary #300

[decko]

Spec

Problem

METRIC_METADATA in html_report.py:180 shows "Target: >0.80" for context_precision and context_recall, but ZONE_THRESHOLDS["score"]["green"] is 0.85. A score of 0.82 satisfies the displayed target but renders in yellow/amber, which contradicts the tooltip from the user's perspective.

Fix

Update both threshold display strings to "Target: >0.85" to match the green zone boundary.

Acceptance Criteria

• context_precision threshold display updated to "Target: >0.85"
• context_recall threshold display updated to "Target: >0.85"
• No other behavior changes
• Towncrier fragment 352.fix

---

Plan

Step 1 — Update METRIC_METADATA in html_report.py

File: src/raki/report/html_report.py, lines ~180 and ~190

# context_precision
"threshold": "Target: >0.85",

# context_recall  
"threshold": "Target: >0.85",

Step 2 — Towncrier fragment

File: changes/352.fix

The HTML report tooltip for ``context_precision`` and ``context_recall`` now shows ``Target: >0.85``, matching the green zone threshold used for color coding.

Estimated scope

• 2 string changes in html_report.py
• 1 changelog fragment