pip >= 23.0 added the PEP 668 --break-system-packages flag. On older pip
builds (e.g. macOS Command Line Tools Python) and on the pip `list`
subcommand of every version, the flag is rejected with
"no such option: --break-system-packages", breaking skill dependency
install/check paths entirely.
- dep_installer: route pip installs through pipRunInstall, which retries
once without the flag when pip rejects it (issue #956)
- pip_update_executor: same retry for the upgrade path
- pip_update_checker: drop the flag from `pip3 list --outdated` - list is
read-only, PEP 668 never applies, and no pip accepts the flag there
- add pip_flags.go helpers + unit tests, and legacy-pip integration tests
reproducing the original failure
Fixes#956
ExtractWikilinks builds a ±25-byte context window around each wikilink
match. When the content contains multi-byte UTF-8 characters (Vietnamese,
CJK, emoji), the byte-offset start/end can fall on a continuation byte,
producing invalid UTF-8 that PostgreSQL rejects with SQLSTATE 22021
('invalid byte sequence for encoding UTF8').
Fix: wrap the byte-offset slice with strings.ToValidUTF8, which strips
any leading/trailing partial runes. This is a minimal one-line change
that preserves the existing context semantics while ensuring the output
is always valid UTF-8.
Available since Go 1.21 (this project uses Go 1.26).
Closes#1472
fchengyan