fix(coding-agent): remove process-cwd tool singletons and use tool-name allowlists

- switch SDK/CLI tool selection to name-based allowlists
- apply allowlists across built-in, extension, and SDK tools
- remove ambient process.cwd defaults from core tooling and resource helpers
- update tests, examples, and TUI callers for explicit cwd plumbing
- add regression coverage for extension tool filtering

closes #3452
closes #2835

packages/coding-agent/src/core/tools/bash.ts

@@ -444,7 +444,3 @@ export function createBashToolDefinition(
 export function createBashTool(cwd: string, options?: BashToolOptions): AgentTool<typeof bashSchema> {
 	return wrapToolDefinition(createBashToolDefinition(cwd, options));
 }
-
-/** Default bash tool using process.cwd() for backwards compatibility. */
-export const bashToolDefinition = createBashToolDefinition(process.cwd());
-export const bashTool = createBashTool(process.cwd());

packages/coding-agent/src/core/tools/edit.ts

@@ -485,7 +485,3 @@ export function createEditToolDefinition(
 export function createEditTool(cwd: string, options?: EditToolOptions): AgentTool<typeof editSchema> {
 	return wrapToolDefinition(createEditToolDefinition(cwd, options));
 }
-
-/** Default edit tool using process.cwd() for backwards compatibility. */
-export const editToolDefinition = createEditToolDefinition(process.cwd());
-export const editTool = createEditTool(process.cwd());

packages/coding-agent/src/core/tools/find.ts

@@ -368,7 +368,3 @@ export function createFindToolDefinition(
 export function createFindTool(cwd: string, options?: FindToolOptions): AgentTool<typeof findSchema> {
 	return wrapToolDefinition(createFindToolDefinition(cwd, options));
 }
-
-/** Default find tool using process.cwd() for backwards compatibility. */
-export const findToolDefinition = createFindToolDefinition(process.cwd());
-export const findTool = createFindTool(process.cwd());

packages/coding-agent/src/core/tools/grep.ts

@@ -382,7 +382,3 @@ export function createGrepToolDefinition(
 export function createGrepTool(cwd: string, options?: GrepToolOptions): AgentTool<typeof grepSchema> {
 	return wrapToolDefinition(createGrepToolDefinition(cwd, options));
 }
-
-/** Default grep tool using process.cwd() for backwards compatibility. */
-export const grepToolDefinition = createGrepToolDefinition(process.cwd());
-export const grepTool = createGrepTool(process.cwd());

packages/coding-agent/src/core/tools/ls.ts

@@ -227,7 +227,3 @@ export function createLsToolDefinition(
 export function createLsTool(cwd: string, options?: LsToolOptions): AgentTool<typeof lsSchema> {
 	return wrapToolDefinition(createLsToolDefinition(cwd, options));
 }
-
-/** Default ls tool using process.cwd() for backwards compatibility. */
-export const lsToolDefinition = createLsToolDefinition(process.cwd());
-export const lsTool = createLsTool(process.cwd());

packages/coding-agent/src/core/tools/read.ts

@@ -271,7 +271,3 @@ export function createReadToolDefinition(
 export function createReadTool(cwd: string, options?: ReadToolOptions): AgentTool<typeof readSchema> {
 	return wrapToolDefinition(createReadToolDefinition(cwd, options));
 }
-
-/** Default read tool using process.cwd() for backwards compatibility. */
-export const readToolDefinition = createReadToolDefinition(process.cwd());
-export const readTool = createReadTool(process.cwd());

packages/coding-agent/src/core/tools/write.ts

@@ -279,7 +279,3 @@ export function createWriteToolDefinition(
 export function createWriteTool(cwd: string, options?: WriteToolOptions): AgentTool<typeof writeSchema> {
 	return wrapToolDefinition(createWriteToolDefinition(cwd, options));
 }
-
-/** Default write tool using process.cwd() for backwards compatibility. */
-export const writeToolDefinition = createWriteToolDefinition(process.cwd());
-export const writeTool = createWriteTool(process.cwd());