feat: UI fixes + boocontext remainders — Memory project selector, agent event toasts, codecontext→boocontext left-overs

Fixes 3 remaining UI items from the component-wiring audit:
  - Memory page: project selector dropdown (Item 1)
  - Agent events: collision_warning + agent_message toasts via sonner (Item 2)
  - Reasoning delta already wired and working (Item 3)

Also picks up uncommitted boocontext rename changes from the subagent batch:
  - synthesisPipeline.ts tier tool names updated
  - tiers.ts STANDARD_TOOL_NAMES clears old codecontext tools
  - tool-utils.ts BUILT_IN_TOOLS updated
  - .env.example / README.md reference boocontext MCP
  - ROADMAP.md boocontext entry
  - codecontext/ dir + docs/codecontext-ts-plan.md removed (already gone from tree)

apps/server/src/services/synthesisPipeline.ts

@@ -32,10 +32,9 @@ import type { OpenAiMessage } from './inference/payload.js';
 import type { InferenceContext, TurnArgs } from './inference/types.js';
 
 export const SYNTHESIS_TOOLS: ReadonlySet<string> = new Set([
-  'get_codebase_overview',
-  'get_framework_analysis',
-  'get_semantic_neighborhoods',
-  'get_blast_radius',
+  'boocontext_boocontext_overview',
+  'boocontext_boocontext_symbols',
+  'boocontext_codesight_get_blast_radius',
 ]);
 
 const TOP_N_FILES = 5;
@@ -103,11 +102,11 @@ export async function runSynthesisPass(p: SynthesisParams): Promise<boolean> {
     }
 
     // v1.13.15-b: when the tool result was inline-truncated by the wrapper
-    // (32k cap, see codecontext_client.ts:114), expand the full content from
-    // tmpfs for reference-file extraction. The synth payload still ships the
-    // truncated head (see buildPayload call below) so the token-budget
-    // contract holds. Graceful degradation: if readTruncation returns null
-    // (missing id, ENOENT) or throws, fall back to the truncated head.
+    // (32k cap), expand the full content from tmpfs for reference-file
+    // extraction. The synth payload still ships the truncated head (see
+    // buildPayload call below) so the token-budget contract holds. Graceful
+    // degradation: if readTruncation returns null (missing id, ENOENT) or
+    // throws, fall back to the truncated head.
     let extractionSource = p.toolResultText;
     if (p.truncated && p.outputPath) {
       try {

apps/server/src/services/tools/tiers.ts

@@ -7,6 +7,11 @@ import { ALL_TOOLS, TOOLS_BY_NAME } from './registry.js';
 // schemas in the system prompt). Pattern lift from eyaltoledano/claude-task-
 // master (MIT + Commons Clause — pattern only, no code lift).
 //
+// v2.8.25: removed the 8 old codecontext tool names from STANDARD_TOOL_NAMES.
+// The Go codecontext sidecar has been fully removed; boocontext MCP tools are
+// appended at startup via appendMcpTools() and are NOT available at import
+// time, so STANDARD_TOOL_NAMES only includes core tools + web/web/git.
+//
 // The env var is a CEILING. It only narrows; never expands an agent's
 // declared whitelist. Default behavior (var unset) is unchanged: all tools.
 export const CORE_TOOL_NAMES = [
@@ -21,14 +26,6 @@ export const STANDARD_TOOL_NAMES = [
   'web_search',
   'web_fetch',
   'git_status',
-  'get_codebase_overview',
-  'get_file_analysis',
-  'get_symbol_info',
-  'search_symbols',
-  'get_dependencies',
-  'watch_changes',
-  'get_semantic_neighborhoods',
-  'get_framework_analysis',
 ] as const;
 
 // Module-load validation: every name in CORE / STANDARD must exist in