docs: unwrap hard-wrapped Markdown to one line per paragraph

Hard line breaks mid-paragraph make docs harder to edit and diff — a
one-word change reflows and re-diffs the whole paragraph. Reflow all
tracked non-vendor Markdown (plus vendor/AGENTS.md) so each prose
paragraph is a single line; soft-wrapping is the editor's job. Fenced
code, tables, and list structure are preserved (wrapped list items fold
to one line per bullet). Documents the convention in AGENTS.md.

packages/system-prompt/README.md

@@ -1,19 +1,14 @@
 # dsh-system-prompt
 
-System prompt assembly registry. Plugins contribute ordered text sections and
-tool-schema providers; the agent loop calls `assemble()` once per step.
+System prompt assembly registry. Plugins contribute ordered text sections and tool-schema providers; the agent loop calls `assemble()` once per step.
 
 ## Service: `SystemPrompt` (ctx key: `systemPrompt`)
 
 ### Public API
 
-- `ctx.systemPrompt.section(section: PromptSection): () => void`
-  Contribute a section. Disposed with the calling fiber.
-- `ctx.systemPrompt.tools(provider: () => ToolSchema[]): () => void`
-  Contribute tool schemas (evaluated at each assembly). Disposed with the calling
-  fiber.
-- `ctx.systemPrompt.assemble(): Promise<PromptAssembly>`
-  Assemble the current prompt. Runs through the `system-prompt/assemble` waterfall.
+- `ctx.systemPrompt.section(section: PromptSection): () => void` Contribute a section. Disposed with the calling fiber.
+- `ctx.systemPrompt.tools(provider: () => ToolSchema[]): () => void` Contribute tool schemas (evaluated at each assembly). Disposed with the calling fiber.
+- `ctx.systemPrompt.assemble(): Promise<PromptAssembly>` Assemble the current prompt. Runs through the `system-prompt/assemble` waterfall.
 
 ### Events
 
@@ -24,24 +19,17 @@ tool-schema providers; the agent loop calls `assemble()` once per step.
 
 ### Key types
 
-- `PromptSection` — `{ name, order, text: string | (() => string) }`. Sections
-  are concatenated in ascending `order`.
-- `PromptAssembly` — `{ sections: PromptSection[], tools: ToolSchema[] }`.
-  Tool schemas are part of the assembly by design: "what the model is told it
-  can do" is one coherent thing, even though adapters transmit schemas as a
-  separate wire field.
+- `PromptSection` — `{ name, order, text: string | (() => string) }`. Sections are concatenated in ascending `order`.
+- `PromptAssembly` — `{ sections: PromptSection[], tools: ToolSchema[] }`. Tool schemas are part of the assembly by design: "what the model is told it can do" is one coherent thing, even though adapters transmit schemas as a separate wire field.
 - `renderPrompt(assembly)` — joins section texts with blank lines.
 
-Merge-extensible: plugins can declare extra fields on `PromptAssembly` via
-declaration merging.
+Merge-extensible: plugins can declare extra fields on `PromptAssembly` via declaration merging.
 
 ### Extension points
 
 - Section providers: AGENTS.md reader, cwd notifier, persona config, etc.
-- Tool schema providers: `ToolRegistry` registers itself as a tool provider
-  automatically.
-- The `system-prompt/assemble` waterfall: mutate or replace the assembly
-  (system-prompt configurability, dynamic tool filtering).
+- Tool schema providers: `ToolRegistry` registers itself as a tool provider automatically.
+- The `system-prompt/assemble` waterfall: mutate or replace the assembly (system-prompt configurability, dynamic tool filtering).
 
 ### What is NOT here