Archive the vendor and ISA documents this port was read against

`cpu-docs/` holds the documents behind the reverse-engineering in this repo, and
`cpu-docs/manifests/` records each source URL with a sha256, a byte count and a
page count. The manifests ARE the archive as far as this history is concerned:
121 MB of vendor PDFs are ignored, exactly as `/zig-pkg/` is, because a re-fetch
is one command away and the manifest makes a drifted document detectable.

The small text sources stay tracked instead of ignored, because Espressif
publishes them in no other form - the esptool serial protocol, firmware image
format and boot-mode selection pages, and the P4's custom PIE/SIMD instruction
reference. There is no PDF to re-fetch in their place.

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