v4.30.0

• Attach shared dependencies on Windows without administrator rights. Creating
  a symbolic link needs SeCreateSymbolicLinkPrivilege (administrators or
  Developer Mode), so adopt and project attach failed with
  WinError 1314: A required privilege is not held by the client on a normal
  account, and the pre-attach probe never caught it. When symlink creation is
  denied, the package link is now created as a directory junction, which any
  user may create and which Lake and Git traverse identically. Every place
  that recognizes an attached package as a link (status, verify,
  unshare, adoption planning, rollback, source fingerprinting) now
  recognizes junctions too.
• Size local dependency checkouts during adopt without descending into
  attached links, using one directory scan per level instead of rglob.
• Show progress while subprocesses run. Lake's [n/m] build steps now stream
  from check, build, and artifact hydration as process.progress events
  (rate-limited to ten per second), rendered on a terminal as one in-place bar
  (lake [████░░░░] 3300/8318 · Building Mathlib.Foo) and in logs as 25%
  checkpoints; every other output line becomes a throttled process.output
  heartbeat shown in place on a terminal, so lake exe cache get is no longer
  silent. Third-party backends that do not accept the new optional on_output
  callback keep working unchanged.
• Announce counted phases that used to be silent: adopt.inspect_started and
  adopt.identity_started for each project during adoption planning, and
  project.detach.package_started for each package unshare materializes; all
  carry current/total and render as the same counted bar.
• Keep the terminal alive during any silent stretch: when no event has arrived
  for two seconds the console shows ⋯ <last activity> (Ns) in place; plain
  logs print Still working: … after ten seconds and then every thirty.
• Name new shared package directories pkg_<32 hex> instead of
  project_package_<64 hex>. The 80-character name pushed Mathlib's deepest
  build outputs past Windows' 260-character path limit, so an adopted Mathlib
  project could hydrate its cache but never finish build
  (failed to create file '…\Isometric.olean.server'). The digest is the same
  identity truncated to 128 bits; existing project_package_* directories stay
  valid and reusable. To move already adopted projects onto short paths,
  lean-runtime project unshare each of them, delete the legacy
  project-packages/project_package_* directories (nothing references them once
  every project is unshared; clean does not yet reclaim them), and
  lean-runtime adopt again.
• Windows correctness fixes surfaced by running the suite on Windows:
  compact source snapshots stage under a shorter directory name so Git's
  shallow-clone metadata stays below MAX_PATH ('$GIT_DIR' too big);
  lean-runtime run rewrites a container backend's POSIX staged path back to
  the user's file on Windows hosts; lock waiters learn the holding operation
  through a .owner sidecar (a byte-locked file cannot be read on Windows);
  declaration shards close their SQLite connection before publication so the
  rename succeeds; storage deduplicates hard links via os.stat() because
  DirEntry.stat() reports no inode on Windows; publish accepts a
  drive-letter origin path (C:\...) instead of treating C as a URL scheme;
  bundle import accepts CRLF working files whose LF-normalized blob is the
  recorded object (core.autocrlf); and storage cleanup clamps negative file
  ages from filesystem timestamp granularity.