Initial implementation of compaction MCP server

Ephemeral, per-session context management for LLMs with 8 MCP tools:
store, query, status, compact, pin, forget, configure, update.

Features: scoring with decay/importance/access, Jaccard dedup,
summary promotion, budget-based eviction, auto-detection of
client context window via MCP hooks.

go.mod

@@ -0,0 +1,17 @@
+module compaction-mcp
+
+go 1.26.1
+
+require github.com/mark3labs/mcp-go v0.45.0
+
+require (
+	github.com/bahlo/generic-list-go v0.2.0 // indirect
+	github.com/buger/jsonparser v1.1.1 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/invopop/jsonschema v0.13.0 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/spf13/cast v1.7.1 // indirect
+	github.com/wk8/go-ordered-map/v2 v2.1.8 // indirect
+	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)