fix(mcp): omit palace_path from tool_status responses (+ docs)

The MCP `mempalace_status` tool was returning the server's absolute
`_config.palace_path` to any connected client on both the main
(ChromaDB-backed) path and the sqlite fallback path that runs when
HNSW divergence is detected (#1222). On a single-user local deployment
this is self-disclosure, but in nested-agent or multi-server MCP
topologies the client is a separate trust domain and the absolute
path has no documented client-side use.

Clients that legitimately need the palace path continue to have three
documented channels: the `MEMPALACE_PALACE_PATH` env var (primary) or
its legacy `MEMPAL_PALACE_PATH` alias, the `~/.mempalace/config.json`
file, and the `--palace` CLI flag on most subcommands.

Also corrects stale docs that claimed `mempalace_reconnect` returned a
`palace_path` field; the code returns `{success, message, drawers,
vector_disabled[, vector_disabled_reason]}` on success, plus a no-palace
shape and an exception shape.

- mempalace/mcp_server.py: drop palace_path from tool_status() and
  _tool_status_via_sqlite() result dicts
- website/reference/mcp-tools.md: update documented return shapes for
  mempalace_status (fix) and mempalace_reconnect (stale-docs correction)

Authored-by: Aaron Salsitz (ICCI LLC, @icciaaron). Claude Code was used
as an authoring and review-orchestration tool, with human-in-the-loop
oversight at every step: Aaron wrote the prompts, reviewed each draft,
called for three independent review passes (drafting / post-rebase
technical / CISA-aligned disclosure-leak), and verified the final patch
behavior before commit.

website/reference/mcp-tools.md

@@ -10,7 +10,7 @@ Palace overview: total drawers, wing and room counts, AAAK spec, and memory prot
 
 **Parameters:** None
 
-**Returns:** `{ total_drawers, wings, rooms, palace_path, protocol, aaak_dialect }`
+**Returns:** `{ total_drawers, wings, rooms, protocol, aaak_dialect }`
 
 ---
 
@@ -378,4 +378,4 @@ Force a reconnect to the palace database. Use this after external scripts or CLI
 
 **Parameters:** None
 
-**Returns:** `{ success, palace_path }`
+**Returns:** `{ success, message, drawers, vector_disabled[, vector_disabled_reason] }` (on no-palace: `{ success: false, message, drawers, vector_disabled }`; on exception: `{ success: false, error }`)