Bump version to 0.0.200 — feature-complete capstone - #493

The capstone release. JSS is feature-complete; consolidation begins after this.

What's in v0.0.200

• feat: MCP server — pod as a tool surface for agents (#490) #491 — `jss start --mcp`: pod as a tool surface for agents (MCP Streamable HTTP, 2025-03-26). 12 tools across CRUD / Skills / Docs / Introspect. Auth reuses the existing chain — every tool call is WAC-gated against the inbound WebID. Skill discovery walks `SKILL.md` at pod/app/bot scopes.
• fix(mcp): use isDirectory not isContainer on listContainer entries #492 — fix(mcp): correct `isDirectory` field on listContainer entries. Caught by live-fire smoke; per-app and per-bot SKILL.md files now discoverable.

The thesis (and the pitch)

MCP needs a backend. Solid is the backend.

Pods host bots. Bots speak MCP. The pod is the bot's world — instructions read from `SKILL.md`, tools are URL-addressable resources, identity is a `did:nostr:` or WebID with the same WAC primitives as any human. Bot-to-bot federation falls out of the protocol for free.

The substrate. Visible payoffs (`solid-apps/charlie`, hosted Charlie via #205) build on top.

After this

JSS development moves into consolidation mode. No new feature work without a strong reason; focus shifts to polish, performance, docs, ecosystem coverage.