A followed file with no timestamp yet is waited for, not held and not an error

[torstei]

What

import --follow (and file-intake) used to bail when the first 1000 lines of a file held no timestamp. The unit restarted every two seconds, and the lines were held in memory meanwhile. Now:

• A file with no stamp yet is waited for, holding nothing. When the first stamp arrives, the unstamped prefix is streamed from the file in 256 KiB blocks with that stamp's time.
• A file rotated away without ever having had a stamp is imported with its modification time.
• A note is printed at 100 MiB and at each doubling, since a never-stamped file looks like a quiet one.
• Copytruncate re-arms the wait when the store is still empty.

Evidence

• 286 MiB unstamped file, stamp appended 4 s after start: peak RSS 12.5 MB, prefix imported at the stamp's time (1145 chunks).
• 3000-line unstamped file: before, error exit in 0.1 s and 0 of 3002 lines stored. After, 3002 of 3002.
• 6 new unit tests; each part mutated and caught by its own test.

Known limits

• A restart while waiting rescans from the start of the file (persisting the position needs the parked hint file).
• A live file that never gets a stamp waits forever, by decision.

Docs: man page, deployment guide, plan status.

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