Adds three handbook pages covering conventions that were previously
scattered across feedback memories or rederived from scratch each
time:
- bedrock.md captures the cross-region inference profile requirement
for Claude 4.x Bedrock Agents and the alias-version pinning gotcha,
plus the IAM resource pattern and the KB Docker requirement.
- dev-environment.md documents the workstation directory layout,
pyenv/Node conventions, the macOS launchd/TCC sandbox gotcha, and
cleanup cadence.
- lambda-template.md provides a minimal SAM scaffold that follows the
Lambda defaults already in aws-infrastructure.md (Python 3.12,
arm64, explicit 60-day log retention, scoped Secrets Manager
access, module-level secret cache).
Also extends two existing pages:
- sam-project-layout.md gains a Lambda Layers section with the
BuildMethod nesting pattern that caused a ~22-hour production
outage when violated.
- naming-conventions.md adds a Legacy Stacks note acknowledging that
pre-convention PascalCase stacks (SeaHavenDoorUnlockStack,
WorkorderIngestStack) stay as-is rather than risk stack
replacement.
