Native memory tools + MCP server + distill agent improvements

Tools:
- Add native memory_render, memory_write, memory_search,
  memory_links, memory_link_set, memory_link_add, memory_used
  tools to poc-agent (tools/memory.rs)
- Add MCP server (~/bin/memory-mcp.py) exposing same tools
  for Claude Code sessions
- Wire memory tools into poc-agent dispatch and definitions
- poc-memory daemon agents now use memory_* tools instead of
  bash poc-memory commands — no shell quoting issues

Distill agent:
- Rewrite distill.agent prompt: "agent of PoC's subconscious"
  framing, focus on synthesis and creativity over bookkeeping
- Add {{neighborhood}} placeholder: full seed node content +
  all neighbors with content + cross-links between neighbors
- Remove content truncation in prompt builder — agents need
  full content for quality work
- Remove bag-of-words similarity suggestions — agents have
  tools, let them explore the graph themselves
- Add api_reasoning config option (default: "high")
- link-set now deduplicates — collapses duplicate links
- Full tool call args in debug logs (was truncated to 80 chars)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

poc-agent/src/tools/mod.rs

@@ -14,6 +14,7 @@ mod edit;
 mod glob_tool;
 mod grep;
 pub mod journal;
+pub mod memory;
 mod read;
 mod vision;
 mod write;
@@ -95,6 +96,7 @@ pub async fn dispatch(
         "grep" => grep::grep(args),
         "glob" => glob_tool::glob_search(args),
         "journal" => journal::write_entry(args),
+        n if n.starts_with("memory_") => memory::dispatch(n, args),
         "view_image" => {
             return match vision::view_image(args) {
                 Ok(output) => output,
@@ -213,5 +215,7 @@ pub fn definitions() -> Vec<ToolDef> {
                 }
             }),
         ),
-    ]
+    ].into_iter()
+        .chain(memory::definitions())
+        .collect()
 }