Fix env install on older uv when exclude-newer-package=false is unsupported

[peter941221]

Problem

prime env install unconditionally appends:

--exclude-newer-package <normalized_name>=false

for uv installs against the Hub simple index.

That works on newer uv releases, but issue #667 shows that uv 0.9.4
rejects <package>=false and fails before installation starts.

Failure mechanism

The current install command builder always emits the per-package
exclude-newer escape hatch in
packages/prime/src/prime_cli/commands/env.py.

On older uv versions, the flag only accepts date-like values, so the command
fails with:

invalid value '<pkg>=false' for '--exclude-newer-package ...'

Semantic change

This change gates the flag behind a small runtime capability probe.

If the installed uv accepts <package>=false, we keep the existing behavior.
If it does not, we omit the flag so prime env install remains usable on
older uv versions.

Preserved invariant

We still preserve the existing Hub simple-index workaround on uv versions that
support it.

Testing

Added unit coverage for both branches:

• omit the flag when uv lacks support
• keep the flag when uv supports <package>=false

Notes

I also ignored .codegraph/ in .gitignore to avoid committing local index
artifacts.

Refs #667

---

Note

Low Risk
Narrow CLI install-path change with unit tests; no auth, secrets, or API contract changes.

Overview
prime env install no longer always passes --exclude-newer-package <pkg>=false for Hub simple-index uv installs. Older uv (e.g. 0.9.4) reject that value and abort before install.

A cached runtime probe (uv --version ≥ 0.11.3 plus uv pip install --help showing the flag) decides whether to append the per-package opt-out. Supported uv keeps the existing Hub workaround; unsupported uv omits the flag so installs proceed.

Unit tests cover the probe and both install-command branches. .codegraph/ is added to .gitignore.

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[chatgpt-codex-connector]

Avoid network-dependent capability probe for uv flag support

This probe treats uv pip install --dry-run ... typing-extensions success as a proxy for syntax support, but --dry-run still resolves dependencies (per uv pip install --help), so transient resolver failures (offline mode, blocked/default index, auth/TLS issues) can make a new uv look unsupported. In those cases _uv_supports_exclude_newer_package_false() returns False and we skip --exclude-newer-package <pkg>=false, which reintroduces the Hub simple-index filtering failure whenever an exclude-newer cutoff is active.

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