feat(bernese): stage GEN/SESSIONS.SES in prepare_campaign (RH-003)

[alfieprojectsdev]

RH-003 — prepare_campaign() stages GEN/SESSIONS.SES (readiness gap #2)

Stacked on #38 (branched off docs/bernese-training-notes); base retargets to main once #38 merges.

Problem

_SUBDIRS omitted GEN, and prepare_campaign() generated no session table. BPE reads GEN/SESSIONS.SES to map a processed session id to its epoch window — without it the run aborts early. This is the exact stall hit during the NAMRIA training week (had to be created by hand).

Change

• Add GEN to _SUBDIRS.
• campaign_builder.generate_sessions_ses() returns the stock daily ???0 session table (one session, whole UTC day 00:00:00–23:59:59) — verbatim from $X/SUPGUI/PAN/SESSIONS.SES and every campaign GEN/SESSIONS.SES on the verified T420 install.
• stage_sessions_ses(gen_dir, template=None) writes it into the campaign GEN/. Copies an explicit install template when given (exact match to the installed Bernese version); never clobbers a pre-existing hand-tuned SESSIONS.SES.
• prepare_campaign() writes SESSIONS.SES unconditionally — independent of CampaignConfig, since BPE needs it regardless of whether station files are generated. New sessions_template= passthrough arg.

Tests

test_campaign_builder.py +5 (daily-template content, GEN in _SUBDIRS, no-config write, template copy, preserve-existing). 80 pass, ruff clean. (mypy: one pre-existing requests import-stub note in download_blq, unrelated to this change.)

Scope note

Other GEN/ general files (ANTENNA_I20.PCV, OBSERV.SEL, SINEX_RNX2SNX.SKL) are also needed for a full run but are separate reference-file staging — out of scope here.

Workflow

First ticket developed under the new git-worktree protocol (.trees/rh-003-gen-sessions), and opened via scripts/open_pr.sh (also added in #38).

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