docs: update for session kinds, Design Contracts, and Implementation Runs
Covers everything the plugin gained since the last wiki refresh:
- SERP AI Sessions rewritten around the current session-kind model —
multi-session lists per scope, live status icons, Claude Code/Codex
agent backends, session spawning, SERP AI Configuration editor, and
the new SERP AI Settings panel.
- New Design Contracts page: the durable approval/implementation
lifecycle above session summaries, plus Design Sync/Reconciliation
and the headless Design Draft session for existing projects.
- New Implementation Runs page: the SERP AI Runs panel that batch-plans
and spawns implementation sessions from design/state drift.
- Explorer rewritten for the current tree (Specs/Deployments/Services/
HMI, Tests and Sequences folders, inline deployment diagrams).
- Test Engine documents generated GTest component tests produced from
sequence diagrams.
- AI-Driven Development, Plugin Overview, Home, and the runtime/
generated-code pages updated to match; stale serp_* MCP tool names
fixed to the current serp.* dotted form throughout.
docs: reframe AI sessions as agent-agnostic, add title to AI-Driven-Development, fix broken links, reframe serp-mini-ivi as demonstration project
docs: fix duplicate title, update intro text on AI-Driven Development page
docs: add AI-Driven Development page, cross-links in Logging/Runtime/Generator