Remove stale cchost mentions across tests, samples, schema, and host config

[Copilot]

The cchost binary was removed in 7.x (each app is now its own executable), but stale references remained throughout the tree.

Tests / infra (Python)

• Replace # Set to cchost default value comments with # Set to node default value in tests/infra/{runner,piccolo_driver}.py, tests/historical_query_{perf,cache}.py, tests/lts_compatibility.py.
• Update --binary-dir help text in tests/infra/e2e_args.py.
• Remove the CCFRemote.BIN = "" class attribute and instead require the binary name on construction: added a binary_name keyword argument to CCFRemote.__init__. For major_version >= 7 (or unspecified), the binary is enclave_file; for major_version < 7, binary_name is asserted to be set and resolved via build_bin_path. infra.node.Node passes binary_name="cchost" for pre-7 nodes.

Host config schema

• Rename doc/host_config_schema/cchost_config.json → host_config.json; update CMakeLists.txt and doc/conf.py.
• Rename C++ struct host::CCHostConfig → host::HostConfig (only used in src/host/configuration.h and src/host/run.cpp).

samples/minimal_ccf

• Drop the obsolete mv .../bin/cchost /usr/bin/cchost step from the runtime Dockerfile and replace it with a mv .../bin/js_generic /usr/bin/js_generic step, with a comment noting js_generic is a sample application binary intended to be replaced with the actual application binary when adapting the image.
• Replace the cchost invocation in run_app.sh with js_generic.
• Rename cchost_config_virtual_js.json → config_virtual_js.json.

Intentionally retained

• CHANGELOG.md historical entries.
• The inline comment in tests/infra/remote.py __init__ explaining the 7.x binary consolidation (kept per review feedback).

[Copilot]

Pull request overview

This PR removes stale references to the deprecated cchost entrypoint across the repo (tests/infra, samples, and the host config schema/docs), reflecting the 7.x+ model where each app is its own executable. It also renames the host config schema file and the corresponding C++ config struct to remove cchost-specific naming.

Changes:

• Update Python test/infra comments and CLI help to refer to “node” rather than cchost, and adjust CCFRemote comments/defaults.
• Rename host config schema to host_config.json and update build/docs wiring; rename host::CCHostConfig to host::HostConfig.
• Update samples/minimal_ccf scripts/config naming and remove a Dockerfile step that staged /usr/bin/cchost.

Custom instructions used:

• .github/copilot-instructions.md
• .github/instructions/reviewing.instructions.md

Reviewed changes

Copilot reviewed 13 out of 15 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/lts_compatibility.py	Update comment referring to node defaults.
tests/infra/runner.py	Update comments referring to node defaults.
tests/infra/remote.py	Adjust CCFRemote.BIN default/comment and inline note for 7.x+.
tests/infra/piccolo_driver.py	Update comment referring to node defaults.
tests/infra/e2e_args.py	Update --binary-dir help text to refer to node executable.
tests/historical_query_perf.py	Update comment referring to node defaults.
tests/historical_query_cache.py	Update comment referring to node defaults.
src/host/run.cpp	Rename config type usage from CCHostConfig to HostConfig.
src/host/configuration.h	Rename host::CCHostConfig struct to host::HostConfig and JSON declarations accordingly.
samples/minimal_ccf/run_app.sh	Switch sample invocation from cchost to js_generic and rename config reference.
samples/minimal_ccf/ccf_runtime/Dockerfile	Remove step that moved cchost into /usr/bin.
samples/minimal_ccf/app/config_virtual_js.json	Add/rename sample config JSON for minimal sample.
doc/host_config_schema/host_config.json	Add/rename host config JSON schema under new name.
doc/conf.py	Point schema-based doc generation to host_config.json.
CMakeLists.txt	Point embedded/installed schema source to host_config.json.

[achamayou]

Thank you for tidying this up, there are a couple of niggles but this is going in the right direction.

[maxtropets]

@copilot

Run set -ex

• git config --global --add safe.directory /__w/CCF/CCF
• ./scripts/ci-checks.sh
  Includes
  Release notes
  TODOs
  Copyright notice headers
  Python lint
  CMake format
  Shell scripts
  C/C++ format
  Python format
  OpenAPI
  TypeScript, JavaScript, Markdown, TypeSpec, YAML and JSON format
  Python types
  Timing
  Summary
  The following checks failed: CMake format

Run formatting script in the way we do in CI, fix this PR

Create a separate PR with your review instructions or skils edited in such a way thay you never forget doing this again (I'm angry)

[Copilot]

@maxtropets I've opened a new pull request, #7884, to work on those changes. Once the pull request is ready, I'll request review from you.

[maxtropets]

@maxtropets I've opened a new pull request, #7884, to work on those changes. Once the pull request is ready, I'll request review from you.

That PR is against main now , as it should be. Formatting to be fixed in this PR, as per CI.yml

@copilot

[Copilot]

@maxtropets I've opened a new pull request, #7886, to work on those changes. Once the pull request is ready, I'll request review from you.

[maxtropets]

@copilot do not wait for any other PRs, they are not blocking this. Fix formatting in this PR by looking into ci.yml to see how it's done.

[Copilot]

@copilot do not wait for any other PRs, they are not blocking this. Fix formatting in this PR by looking into ci.yml to see how it's done.

Fixed in 379f54a — ran scripts/cmake-format-checks.sh -f (the same gersemi check as CI) which reformatted the file(READ ...) call in CMakeLists.txt (now fits on one line after the cchost_config.json → host_config.json rename). scripts/cmake-format-checks.sh now passes cleanly.