feat(mcp): adopt mainstream server-qualified MCP tool naming

Research across 8 multi-server agent clients (Claude Code, Codex, Gemini
CLI, VS Code, Cline, Roo Code, Goose, OpenCode) showed all of them keep
the server namespace in model-facing MCP tool names; the RFC's premise
for raw names ("servers already prefix their tools") is false for the
official GitHub/filesystem/Sentry servers.

- Config: drop toolPrefix; require serverName ([A-Za-z0-9_-]{1,32}),
  duplicate serverName fails the later instance at load (per-root
  reservation, released on dispose)
- Names: always mcp__<serverName>__<rawName>; normalize to the DeepSeek
  64-char [A-Za-z0-9_-] contract with a deterministic 12-hex identity
  hash on lossy normalization; raw name is the only thing sent on the
  wire (tools/call)
- Sync: two-phase fetch/swap — fetch failure keeps the previous
  generation; a swap conflict rolls back the whole generation (never a
  partial set); duplicate raw names reject the tool list
- RFC: moved to implemented/ (status + skeleton rewritten per the
  format contract), naming design + tier-level test coverage recorded
- Tests: naming algorithm unit suite; keyless Streamable HTTP e2e
  against an in-process StreamableHTTPServerTransport (namespace
  discovery, execution, per-request auth headers); dotted-name
  normalization e2e via a new fixture tool

docs/rfc/INDEX.md

@@ -13,7 +13,6 @@ Generated by `pnpm run gen-rfc-index` from the RFC tree — never edit by hand;
 | [Code Mode — the model writes TypeScript against the tool registry](proposed/feature/2026-06-15-code-mode.md) | 2026-06-15 |
 | [Pre-tool input rewrite — a consistent design](proposed/feature/2026-06-30-pre-tool-input-rewrite.md) | 2026-06-30 |
 | [Claude Code and Codex subagent backends (out-of-process delegation to external coding agents)](proposed/feature/2026-07-07-claude-code-and-codex-subagent-backends.md) | 2026-07-07 |
-| [MCP client plugin — connect to external MCP servers and bridge their tools](proposed/feature/2026-07-07-mcp-client-plugin.md) | 2026-07-07 |
 | [Repeat-tool-call guard plugin](proposed/feature/2026-07-08-repeat-tool-guard.md) | 2026-07-08 |
 
 ### Simplification
@@ -64,6 +63,7 @@ Generated by `pnpm run gen-rfc-index` from the RFC tree — never edit by hand;
 | [SessionStore fork API](implemented/feature/2026-06-30-session-store-fork-api.md) | 2026-06-30 |
 | [Subagent lifecycle enrichment — lastAssistantMessage (observe-only)](implemented/feature/2026-06-30-subagent-observe-enrich.md) | 2026-06-30 |
 | [Explicit model-facing tool order](implemented/feature/2026-07-06-explicit-tool-order.md) | 2026-07-06 |
+| [MCP client plugin — connect to external MCP servers and bridge their tools](implemented/feature/2026-07-07-mcp-client-plugin.md) | 2026-07-07 |
 
 ### Simplification