release: v0.6.0

[jeremy-wayland]

Summary

• Move the current [Unreleased] notes into [0.6.0] - 2026-09-16 and leave an empty [Unreleased] section for follow-on work.
• Bump Cargo workspace, MCP Registry (.mcp/server.json), VS Code extension, Agent Plugins manifest, and Topos skill versions to 0.6.0.

Why 0.6.0 (not 0.5.2)

SemVer minor: Graphify removal drops MCP tools, CLI subcommands, and refactor targets; plus additive harness/surface (Agent Plugins, pi install).

Condensed changelog (since v0.5.1)

Added

• Agent Plugins package (#311) — portable agent-plugin/ for Agent Plugins 1.0 clients.
• topos install pi (#360 / #345) — ninth harness; MCP entry in ~/.pi/agent/mcp.json (via pi-mcp-adapter) plus optional skill path reference in settings.json.

Fixed

• Byte-deterministic JSON (#360 / #332) — sorted map keys on CLI and MCP wire payloads.
• Discovery and path filtering (#358).
• TypeScript parsing & CPG sinks (#359).

Breaking

• Graphify integration removed (#326) — MCP tool count 18 → 17; lower context-budget ratchet.

Changed

• Near-zero passing pillars show ! WARN (#360 / #350) — gates/JSON unchanged.
• MCP SDK rmcp 3.x (#324, #337).
• Security overlay short-circuit (#331).

Included PRs

PR	Notes
#311	Agent Plugins 1.0
#324, #337	rmcp 3.x
#326	Graphify removal
#331	Security overlay perf
#358	CLI discovery / ignores
#359	TypeScript / CPG fixes
#360	Deterministic JSON, WARN status, pi harness

OpenWiki-only merges omitted.

Verification

• python3 scripts/check_versions.py --tag v0.6.0
• python3 scripts/check_skill.py
• python3 scripts/check_agent_plugin.py
• python3 scripts/generate_self_badge.py --self-check
• cargo fmt --all -- --check
• cargo test --workspace
• cargo clippy --workspace --all-targets -- -D warnings
• git diff --check

Release checklist

• release branch is based on current main
• changelog contains only changes already merged to main
• final review
• squash-merge into main
• tag the resulting squash commit v0.6.0

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