docs: add read-doc skill, tighten CLAUDE.md and skill docs (#3778)HEADmaster

* docs: add read-doc skill for on-demand datasheet lookup

Search and read MCU datasheets, reference manuals, errata, and the USB
spec from a local Calibre library ($HOME/Documents/calibre-library)
instead of answering register/bitfield/pinout questions from model
memory. Gated on the library's existence, so it no-ops for contributors
who don't have it.

* docs: reference read-doc skill and tighten CLAUDE.md

Point the datasheet/reference entry at the new read-doc skill, and trim
sections that only duplicate a skill already owning the detail:
PVS-Studio and Code Size collapse to pointers; GDB/Build/Flash command
blocks condensed to essentials. 213 -> 129 lines; behavioral guidelines
and the validation checklist unchanged.

* docs: tighten skill redundancy; rename AGENTS.md refs to CLAUDE.md

code-size: fold the step list into a sentence and drop invocation
examples the argument tables already cover. hil: merge the duplicated
self-lock bullets and compress the hifiphile note. usbmon: compress the
group-membership setup paragraph. All commands, flags, lock rules, and
report paths preserved. usb-target-debug and the pvs script only get
stale AGENTS.md references renamed to CLAUDE.md (now the real file);
run_pvs.sh no longer cites a --dump-files mention that CLAUDE.md dropped.

* docs: fix review findings — restore Espressif cd step, ELF placeholder, code-size comment

Codex/Copilot/Claude review of #3778: the condensed Espressif bullet
lost its cd (idf.py resolves the project from CWD, so the command failed
from repo root); the GDB example now uses the build/your_app.elf
placeholder that docs/troubleshooting.rst established; the code-size
invocation comment no longer references --combined, which the shown
command doesn't use.

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