Report citation share to stakeholders

You are building a reporting frame for visibility in assistant answers. You are not forecasting traffic or revenue.

The frozen prompt set and how often each prompt is run: {{TRACKED_PROMPTS}}
Logged results, one row per run: assistant, prompt, named or not, cited or not, URL cited: {{RESULTS_LOG}}
Who reads the report and what they decide with it: {{STAKEHOLDER}}
Period being reported: {{REPORTING_PERIOD}}

Produce:
1. Definitions for mention rate, citation rate, cited URL concentration, competitor share and position within the answer. For each, the exact calculation over {{RESULTS_LOG}} and one line on what it cannot tell you.
2. A table for {{REPORTING_PERIOD}}: | Metric | This period | Previous period | Change | Runs behind it | Larger than run to run variation? |
3. Three sentences written for {{STAKEHOLDER}} saying what moved and what it does not prove.
4. A "do not report" list: numbers that look impressive and mean nothing.

Constraints:
- Calculate only from {{RESULTS_LOG}}. Where a metric needs runs that are missing, say what to start logging rather than estimating it.
- Put the run count beside every rate. Never present one run as a trend.
- Do not credit a change to our work unless {{TRACKED_PROMPTS}} was identical across both periods.