refactor(token-meter): simplify singleton service (round 1)

examples/coding-agent/cordis.yml

@@ -46,12 +46,12 @@
       Verify your work by running the code or tests. Keep answers brief and
       factual.
 
-# Replay-aware request pressure for the bundled DeepSeek model profiles.
+# Replay-aware request pressure with one service-wide context window.
 - id: token-meter
   name: '@deepseek-ai/dsh-token-meter'
 
 # Summarize an older range when measured history approaches the context window.
-# Built-in model policies provide the ordinary threshold and retained-tail defaults.
+# Service-wide policy provides the ordinary threshold and retained-tail defaults.
 - id: compact-basic
   name: '@deepseek-ai/dsh-compact-basic'
 

examples/coding-agent/tests/compaction.e2e.ts

@@ -34,14 +34,11 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY)('compaction: a long session compa
     ctx = await codingHarness(workdir, {
       persona: SYSTEM_PROMPT,
       tokenMeter: {
-        models: {
-          'deepseek-v4-flash': { contextWindow: 2000 },
-        },
+        contextWindow: 2000,
       },
       compact: {
-        models: {
-          'deepseek-v4-flash': { thresholdRatio: 0.5, retainTokens: 400 },
-        },
+        thresholdRatio: 0.5,
+        retainTokens: 400,
         summarizationModel: '',
         maxTokens: 1024,
         compactionRetries: 1,

examples/coding-agent/tests/harness.ts

@@ -48,7 +48,7 @@ export interface CodingHarnessOptions {
    * compaction plugin (the default suites run without it).
    */
   compact?: BasicCompactConfig
-  /** Optional meter profiles loaded before compact-basic. */
+  /** Optional token-meter capacity loaded before compact-basic. */
   tokenMeter?: TokenMeterConfig
 }
 
@@ -65,7 +65,7 @@ export async function codingHarness(workdir: string, options: CodingHarnessOptio
   await ctx.plugin(ToolBash)
   await ctx.plugin(ToolTodo)
   // Compaction is opt-in: only the compaction e2e loads the reusable meter and
-  // backend, with a lowered profile window so a short real session crosses the threshold.
+  // backend, with a lower context window so a short real session crosses the threshold.
   if (options.compact !== undefined) {
     await ctx.plugin(TokenMeterService, options.tokenMeter)
     await ctx.plugin(BasicCompactService, options.compact)