Release program after finishing program emit, Only cache dts and json source files

[sheetalkamat]

Parity with Strada:
Release program after emit - (this releases program all together and snapshot for now but it will be retained for --w like in strada)
Cache only source files for d.ts and json files as those are the ones that are exepected to be reused

Fixes #1622

[Copilot]

Pull Request Overview

This PR implements parity with Strada by releasing programs after emit and optimizing source file caching. It focuses on memory management and performance improvements for the TypeScript compiler port.

Key changes:

• Introduces program lifecycle management through MakeReadonly() to release programs after emit
• Refactors program baselining to use a callback-based approach for better memory efficiency
• Optimizes source file caching to only cache .d.ts and .json files that are expected to be reused

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
internal/execute/watcher.go	Adds program callback to testing interface during watch cycles
internal/execute/tsctests/sys.go	Refactors program baselining from collection-based to callback-based approach
internal/execute/tsctests/runner.go	Updates test runner to use new baselining interface
internal/execute/tsc/compile.go	Removes IncrementalProgram array from command result, adds program callback interface
internal/execute/tsc.go	Adds program callback invocation for non-watcher compilation
internal/execute/incremental/program.go	Introduces MakeReadonly() method and refactors testing data structure
internal/execute/incremental/emitfileshandler.go	Updates to use new testing data structure
internal/execute/incremental/affectedfileshandler.go	Updates to use new testing data structure
internal/execute/build/host.go	Optimizes source file caching to only cache .d.ts and .json files
internal/execute/build/buildtask.go	Implements program release after emit using MakeReadonly()

Comments suppressed due to low confidence (1)

internal/execute/incremental/program.go:312

• This function is now empty and appears to be unused. Consider removing it if it's no longer needed, or add a comment explaining why it's kept as a stub.

		return

[jakebailey]

Cache only source files for d.ts and json files as those are the ones that are exepected to be reused

I'll be curious if in the future we can still cache input ts files, given people can use build mode to parse out the same set of files multiple times, e.g. for tests or for multi-emit-formats. But, from your wording, it sounds like you're saying that Strada did not do this?

[sheetalkamat]

Cache only source files for d.ts and json files as those are the ones that are exepected to be reused

I'll be curious if in the future we can still cache input ts files, given people can use build mode to parse out the same set of files multiple times, e.g. for tests or for multi-emit-formats. But, from your wording, it sounds like you're saying that Strada did not do this?

yeah - with project references - we will reference output file - which is d.ts file for the common projects so its very rare to have .ts files hence we didnt cache them - also that increases foot print in memory which bigger problem in Strada so we have has some optimizations there.

Esp imaging programs with 60k+ files, it quickly adds up