# Implementation Lessons

Reusable knowledge discovered during implementation work.

## Format

```markdown
# Lesson-NNNN: <title>

Date: YYYY-MM-DD
Author: <agent>
Context: <what task/situation>
Recurring: yes | no

## What was learned

<the lesson>

## Application

<when/how this applies to future work>

## Evidence

<supporting evidence — file:line, commands, outputs>
```

## Index

_No lessons recorded yet._