Sync marketplace versions to post-Wave-C identity releases

[RichardHightower]

Parent plan

Tracks: okf-plugin#55

Why

Wave C identity merges bumped foundation + core versions. Marketplace still pins pre-Wave-C versions:

Plugin	Marketplace pin	Live
second-brain-core	0.3.1	0.3.2
okf-graph-eng	0.7.0	0.7.1
project-knowledge-capture	0.7.0	0.7.1
system-architecture-capture	0.4.0	0.4.1
data-engineering-knowledge-capture	0.3.0	0.3.1
okf-agent-graph	0.6.0	0.6.1
worklog	0.24.0	0.24.1

Job packs remain 0.3.1 (correct).

Deliverable

1. Bump the 7 pins in marketplace.json and .claude-plugin/marketplace.json (keep in sync)
2. Marketplace metadata version → 0.3.2
3. CHANGELOG entry for 0.3.2

Process

Human OK before merge. #55 stays open.