docs(tools): sync bounded output contracts

docs/config-catalog.md

@@ -1053,7 +1053,7 @@ export interface Config {
 }
 ```
 
-Source: [`packages/spill/spill-policy/src/index.ts:50`](../packages/spill/spill-policy/src/index.ts)
+Source: [`packages/spill/spill-policy/src/index.ts:51`](../packages/spill/spill-policy/src/index.ts)
 
 ## `@deepseek-ai/dsh-subagent-acp`
 

docs/core-data-structures/filesystem.md

@@ -205,7 +205,7 @@ interface FsPolicyExec {
 
 ## Read outcome (consumer / read rendering)
 
-A text read is bounded by line window, byte cap, and backend limits. The outcome the model-facing `read` tool renders is purely presentational; there is no `full`/`partial` view — authorization is freshness-based (the tool emits `fs/observed` with the stat's version directly), so any windowed read can authorize a later write/edit when the file is unchanged. Read windowing and this outcome shape live in `dsh-tool-fs` (the executor that owns the read), not in the policy plugin.
+A text read is bounded by line window, byte cap, and backend limits. After the byte cap is reached, scanning continues without retaining more lines so `totalLines` remains exact. The outcome the model-facing `read` tool renders is purely presentational; there is no `full`/`partial` view — authorization is freshness-based (the tool emits `fs/observed` with the stat's version directly), so any windowed read can authorize a later write/edit when the file is unchanged. Read windowing and this outcome shape live in `dsh-tool-fs` (the executor that owns the read), not in the policy plugin.
 
 ```ts type-equiv
 /** Outcome of a bounded text read — what {@link formatReadOutput} renders. */
@@ -214,9 +214,9 @@ interface FileReadOutcome {
   offset: number
   /** Returned lines, already numbered. */
   lines: FileTextLine[]
-  /** Total line count in the file, unless `truncatedByBytes` stopped scanning early. */
+  /** Exact total line count in the file. */
   totalLines: number
-  /** Whether selected output hit the byte cap before EOF or the requested limit. */
+  /** Whether selected output hit the byte cap. */
   truncatedByBytes?: true
 }
 ```