fix(cli): restore implementation hunks dropped by merge resolutions

[Kartikey1306]

master is broken right now

ebuild does not start, and the test suite runs zero tests:

$ python -c "import ebuild.cli.commands"
NameError: name 're' is not defined
$ python -m pytest tests/ -q
!!!! Interrupted: 9 errors during collection !!!!

Why

Four PRs landed their tests while their implementation was discarded during conflict resolution. The merges that did it were never gated by a run — f5209ac, the current master head, has no CI runs at all.

PR	merge	landed	dropped
#64	6a22e36	test_golden_path_commands.py	_workspace_repo_paths, _cached_repo_libraries, _record_board_selection, _EOS_PROJECT_CONFIG, configure --board
#89	32348f0	five re. uses	import re
#90	d3958f7	the initramfs assertions	_newc_members helper, os / stat imports
#92	—	version_key → version_sort_key rename	the caller in the tests

Verifiable per-symbol — for #64, present on the branch, absent on the merge result:

$ git show 6a22e36^2:ebuild/cli/commands.py | grep -c _workspace_repo_paths   # 1
$ git show origin/master:ebuild/cli/commands.py | grep -c _workspace_repo_paths  # 0

Two user-visible regressions this restores

• package_paths lost its {**_workspace_repo_paths(), **_install_packages(...)} merge, so a scaffolded project that uses eos or eboot gets no include or link paths from ~/.ebuild/repos — back to fatal error: eos/hal.h: No such file or directory, the exact bug fix(mvp): repair the first-run developer path #64 fixed.
• configure lost --board entirely, so the documented golden path (configure --board stm32f4 then a bare build) fails with no such option: --board.

What this PR does

Restores those hunks verbatim from the branches that were merged — no new design. Every restored function keeps its original docstring.

Result

	before	after
collection	9 errors, 0 tests run	clean
passing	0	446

Still failing (pre-existing, out of scope)

• 7 — doctor (feat(cli): add ebuild doctor — one-command environment diagnosis #72) and package (feat(cli): add ebuild package — assemble the eFirmware .efw image #77) are two more features whose implementations the same merges dropped; they are 400+ line features and should be restored by their authors rather than re-landed here. Neither command is registered on master today.
• 2 — _shared_flag / -dynamiclib on macOS.
• 1 — test_measures_a_real_binary (assert 0 >= 4096).
• 1 — version_sort_key("1.2.11") < version_sort_key("1.2.11b") is inverted: _component_key("11b") returns (0, 0, '11b'), which sorts below (1, 11, ''). OpenSSL-style letter suffixes should sort above their base.
• 1 — REPOS points at default branch main, but embeddedos-org/eos has no main; ebuild setup fails for every new developer.

Happy to take the last two in follow-ups.

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