Extend PHILOSOPHY.md, pnpr/AGENTS.md, REVIEW_GUIDE.md, .coderabbit.yaml, and
.pr_agent.toml so the repository philosophy applies to pnpr and establishes
that pnpr is pre-1.0 on the alpha prerelease lane (experimental per
PHILOSOPHY.md), consolidating storage layouts, internal record formats,
configuration keys, and CLI flags in place before 1.0 without
backward-compatibility fallbacks, aliases, or migration commands between alpha
builds.
- Remove pnpr upgrade-storage and Command::UpgradeStorage.
- Remove legacy .pnpr-journal recovery path and journal manifest serde aliases
(packument_file, tarballs).
- Remove StoredDerivedTar::Legacy and DerivedTar::scanned in .tar-integrity
records.
- Remove the redundant /v1 segment from compiler_cache_path.
- Remove CLI subcommand and flag aliases (pnpr config-check,
--packument-ttl-secs, --no-check-hashes, --min-age-secs, --max-age-secs) and
the PNPR_PACKUMENT_TTL_SECS env fallback.
- Remove YAML configuration snake_case, *_secs, maxage, and backend.postgresql
serde aliases, standardizing on camelCase.