feat!: rename to InDevContainer (idc) and add idc copilot

[rosstaco]

The project has outgrown the dcode name. It now builds containers, shells in, and (new!) execs the GitHub Copilot CLI inside them. This PR rebrands the project to InDevContainer, renames the CLI binary to idc, restructures the CLI as proper subcommands, and adds idc copilot.

The Release-As: 1.0.0 trailer on commit 1 tells release-please to cut v1.0.0 for this rebrand rather than its default 0.6.0 bump (since bump-minor-pre-major: true).

What changes

New CLI surface

Old	New
dcode <path>	idc code <path>
dcode shell <path>	idc shell <path>
dcode doctor	idc doctor
dcode update	idc update
(none)	idc copilot [<path>] [args...] — new
dcode (bare)	idc prints help (was: opened cwd in VS Code)

• No top-level positional any more, so the old _looks_like_subcommand workaround is gone.
• -i/--insiders moved from the top-level parser onto the subcommands that actually use it (code, shell).
• idc copilot accepts flags transparently — idc copilot --yolo --resume Just Works (no -- separator required). The first non-flag arg becomes the project path; everything else forwards verbatim. A literal -- is still honored as an explicit escape hatch.

Package / distribution

• src/dcode/ → src/indevcontainer/ (git rename, history preserved at 76–100% similarity per file).
• pyproject.toml: name = "indevcontainer"; [project.scripts] entry becomes idc = "indevcontainer.cli:main"; URLs point at rosstaco/InDevContainer.
• release-please-config.json: package-name = "indevcontainer".
• User-facing stderr prefix: dcode: → idc: everywhere.
• update.py: now uv tool upgrade indevcontainer; install URL & uv-tool-list regex updated.
• version_check.py: GitHub API URLs updated; User-Agent → idc-doctor.

idc copilot implementation

• Shares container resolution with idc shell via a new prepare_container_exec() helper in shell.py returning a ContainerExec dataclass (container_id, exec_user, workdir, ssh_sock, workspace_folder, devcontainer_cfg, main_repo, rel_path).
• Probes command -v copilot inside the container before exec'ing, so a missing copilot binary fails fast with a clear install hint (e.g. npm install -g @github/copilot) instead of an opaque 127.
• Bypasses argparse so flags forward transparently; _split_copilot_args() cleanly separates path from forwarded args.

Docs

• README.md rewritten under the new brand with a "Renamed from dcode" callout, idc copilot section, updated examples throughout.
• .github/copilot-instructions.md documents the new architecture (subcommand layout, prepare_container_exec helper, idc: prefix convention, binary/package split).

Breaking changes ⚠️

• The dcode tool is no longer published. Users must:

  uv tool uninstall dcode
  uv tool install git+https://github.com/rosstaco/InDevContainer

• dcode . → idc code . (and similarly for shell, doctor, update).
• Bare dcode opened the cwd in VS Code; bare idc prints help.
• Python import path: from dcode.X import Y → from indevcontainer.X import Y (only matters for embedders / scripts that import internals).
• No dcode compatibility shim is shipped — the rename is a hard cut.

Migration (for repo maintainers)

After merging, the recommended sequence is:

1. Merge this PR into main.
2. Rename the GitHub repo: Settings → General → Repository name → InDevContainer. GitHub permanently redirects all the old URLs.
3. Update local remote:

   git remote set-url origin https://github.com/rosstaco/InDevContainer.git

4. Merge the release-please PR that appears next. Release-please will cut v1.0.0 thanks to the Release-As: 1.0.0 trailer, and the release page will land on the canonical new URL.

Doing the rename around this merge keeps everything canonical from v1.0.0 onward (rather than relying on GitHub's redirect for the uv tool install URL, version-check API calls, and the GitHub Release page).

⚠️ Never recreate a repo at rosstaco/dcode afterwards — that would break the redirect for any user still referencing the old name.

Verification

• ✅ uv run ruff check — clean
• ✅ uv run pytest — 347 passed (was 318; +29 new tests for the restructured CLI, copilot dispatch, _copilot_installed probe, _split_copilot_args)
• ✅ Smoke: idc --help, bare idc, idc {code,shell,copilot,doctor,update} --help, python -m indevcontainer --help all render correctly
• ✅ idc copilot --yolo --resume (outside a devcontainer) reaches run_copilot and exits with the expected idc: no devcontainer.json found …; run \idc doctor` to diagnose`

Commits

SHA	Message
c60ed14	feat!: rename project to InDevContainer; CLI binary becomes idc (carries Release-As: 1.0.0)
78d6ed8	feat!: restructure CLI as subcommands and add idc copilot
cdb2d3a	docs: rewrite README and copilot-instructions for InDevContainer rebrand

(The branch also includes 7d724db feat(research): add findings on extending with SSH agent forwarding and VS Code CLI bridge — a research-findings doc that was already on this lineage before the rebrand work began.)

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🤖 Branch prepared by GitHub Copilot CLI. Commits are unsigned — the ssh-agent was empty when committing; rebase with --exec 'git commit --amend --no-edit -S' to re-sign before merge if your verification flow requires it.