programs: add multi-record decoder properties (firmware >=3.0 records)

The 6 multi-record ProgType values (WHEN/AT/EVERY/AND/OR/THEN) now have
typed accessors on the Program dataclass:

  is_multi_record()  - classifier for ProgTypes 5-10
  event_id           - WHEN trigger event-id (same property as EVENT, no
                       Mon/Day swap, BE wire form)
  and_family         - AND record byte-1 family + operand bits (mirrors
                       compact-form cond's high byte: ZONE=0x04, CTRL+ON=0x0A,
                       OTHER=0x00, etc.)
  and_instance       - AND record bytes 3-4 BE u16 (zone#, unit#,
                       MiscConditional value, ...)
  every_interval     - EVERY record bytes 3-4 BE u16 (recurrence interval)

AT records reuse the existing month/day/days/hour/minute fields (same
byte layout as compact-form TIMED, just with cmd/par/pr2 zero).
OR records carry no payload — only the ProgType byte distinguishes
them. THEN records reuse cmd/par/pr2 (same layout and LE byte order
as compact-form action fields).

10 new tests cover the empirical captures from pca-re/clausal-re:

  - is_multi_record() classifier
  - WHEN event_id for Zone 5 Secure and Zone 1 Secure
  - EVERY 5 SECONDS interval decoding
  - AND IF UNIT 1 ON, AND IF ZONE 5 SECURE, AND IF NEVER family+instance
  - AT record month/day/days/hour/minute
  - OR record all-zero invariants
  - THEN record cmd/par/pr2 (UNIT 1 ON)

All byte vectors in the tests come from real PC Access captures in
pca-re/clausal-re/06-10.pca with firmware override at 3.0+.

The and_family and and_instance properties derive from the existing
cond and cond2 fields via byte-swap — disk bytes 1-4 of AND records
use BE u16 order, but Program's cond/cond2 fields are LE-decoded
(per compact-form convention). The byte-swap formula
((cond2 & 0xFF) << 8) | ((cond2 >> 8) & 0xFF) yields the BE
interpretation without re-reading raw bytes.

473 tests passing (up from 463).

src/omni_pca/programs.py

@@ -765,15 +765,88 @@ class Program:
 
     @property
     def event_id(self) -> int:
-        """The 16-bit event identifier (only meaningful for EVENT type).
+        """The 16-bit event identifier (only meaningful for EVENT or WHEN type).
 
-        Composed as ``(month << 8) | day`` per ``clsProgram.Evt``. For
-        non-EVENT program types this is a curiosity at best — it will
-        still be a 16-bit value but the calendar fields it draws from
+        Composed as ``(month << 8) | day`` per ``clsProgram.Evt``. Holds the
+        same wire-form value for both compact-form ``EVENT`` records and
+        multi-record ``WHEN`` records — both use bytes 9-10 in BE order
+        (the file-form Mon/Day swap is undone by ``from_file_record``).
+        For non-EVENT / non-WHEN types this is a curiosity: the value is
+        still a 16-bit composition, but the calendar fields it draws from
         carry their direct meaning instead.
         """
         return ((self.month & 0xFF) << 8) | (self.day & 0xFF)
 
+    # ---- multi-record (firmware ≥3.0.0) decoder properties ----
+
+    def is_multi_record(self) -> bool:
+        """True iff this record is one of the multi-record ProgTypes.
+
+        Multi-record types (``WHEN`` / ``AT`` / ``EVERY`` / ``AND`` /
+        ``OR`` / ``THEN``, values 5-10) appear only on firmware
+        ≥3.0.0. They form a sequential block: one record per visual
+        line in the PC Access program-block editor. A complete block
+        is therefore a *contiguous run* of multi-record records, not
+        a single record.
+        """
+        return self.prog_type >= ProgramType.WHEN
+
+    @property
+    def and_family(self) -> int:
+        """For AND records (ProgType=8): the condition family + operand bits.
+
+        Mirrors the *high byte* of the compact-form ``cond`` u16 — same
+        ``ProgramCond`` family codes (``ZONE=0x04``, ``CTRL=0x08``,
+        ``TIME=0x0C``, ``SEC=0x10``) plus bit 1 (= bit 9 of the u16)
+        as the operand (e.g. ``0x0A`` = CTRL + ON, ``0x06`` = ZONE +
+        NOT_READY).
+
+        Empirical evidence: ``AND IF ZONE 5 SECURE`` → ``0x04``,
+        ``AND IF UNIT 1 ON`` → ``0x0A``, ``AND IF NEVER`` → ``0x00``.
+
+        Only meaningful when ``prog_type == AND``. For other types the
+        value is whatever happens to be at byte 1 of the record.
+        """
+        # Disk byte 1 ↔ low byte of the LE-decoded ``cond`` field
+        # (the Read function's LE swap puts disk byte 1 into the high
+        # nibble of the in-memory u16, which we then expose as ``cond``).
+        return self.cond & 0xFF
+
+    @property
+    def and_instance(self) -> int:
+        """For AND records (ProgType=8): the object/instance number.
+
+        Stored as a BE u16 at bytes 3-4 of the AND record. Returns:
+        zone # for ZONE family, unit # for CTRL family,
+        ``MiscConditional`` value for OTHER family, etc.
+
+        Empirical evidence: ``AND IF ZONE 5 SECURE`` → 5,
+        ``AND IF UNIT 1 ON`` → 1, ``AND IF NEVER`` → 1
+        (MiscConditional.NEVER).
+
+        Only meaningful when ``prog_type == AND``.
+        """
+        # Disk bytes 3-4 = BE u16, but ``cond2`` was LE-decoded.
+        # The BE-interpreted value is the byte-swap of ``cond2``.
+        return ((self.cond2 & 0xFF) << 8) | ((self.cond2 >> 8) & 0xFF)
+
+    @property
+    def every_interval(self) -> int:
+        """For EVERY records (ProgType=7): the recurrence interval.
+
+        Stored as a BE u16 at bytes 3-4. PC Access exposes preset
+        values like "5 SECONDS", "10 SECONDS", "1 MINUTE", etc.; the
+        unit of the integer (seconds vs minutes vs hours) is decided
+        by the controller firmware — needs more captures with varied
+        UI selections to disambiguate. The "5 SECONDS" UI default
+        encodes as ``every_interval == 5``.
+
+        Only meaningful when ``prog_type == EVERY``.
+        """
+        # Same byte-swap rationale as ``and_instance`` — bytes 3-4
+        # are BE on disk but ``cond2`` is LE-decoded.
+        return ((self.cond2 & 0xFF) << 8) | ((self.cond2 >> 8) & 0xFF)
+
     def is_empty(self) -> bool:
         """True iff the encoded record would be all-zero.
 

tests/test_programs.py

@@ -417,3 +417,154 @@ def test_misc_conditional_enum_matches_csharp() -> None:
     assert MiscConditional.AC_POWER_OFF == 8
     assert MiscConditional.BATTERY_OK == 11
     assert MiscConditional.ENERGY_COST_CRITICAL == 15
+
+
+# ---- multi-record (firmware ≥3.0.0) decoder properties ----------------
+
+
+def test_is_multi_record_classifier() -> None:
+    """Compact-form ProgTypes (0-4) are NOT multi-record; 5-10 ARE."""
+    for pt in (
+        ProgramType.FREE,
+        ProgramType.TIMED,
+        ProgramType.EVENT,
+        ProgramType.YEARLY,
+        ProgramType.REMARK,
+    ):
+        p = Program(prog_type=int(pt))
+        assert not p.is_multi_record(), f"{pt.name} should NOT be multi-record"
+    for pt in (
+        ProgramType.WHEN,
+        ProgramType.AT,
+        ProgramType.EVERY,
+        ProgramType.AND,
+        ProgramType.OR,
+        ProgramType.THEN,
+    ):
+        p = Program(prog_type=int(pt))
+        assert p.is_multi_record(), f"{pt.name} SHOULD be multi-record"
+
+
+def test_when_event_id_zone_5_secure() -> None:
+    """WHEN record bytes 9-10 = (family, instance) in BE wire form.
+
+    Empirical capture: "WHEN ZONE 5 SECURE" yields bytes 9-10 = [04, 05]
+    → event_id = 0x0405 (= (ZONE=4, instance=5)).
+    """
+    body = bytes.fromhex("05 00 00 00 00 00 00 00 00 04 05 00 00 00".replace(" ", ""))
+    p = Program.from_file_record(body, slot=17)
+    assert p.prog_type == ProgramType.WHEN
+    assert p.event_id == 0x0405
+    # The family code 0x04 in the high byte matches ProgramCond.ZONE
+    assert (p.event_id >> 8) & 0xFC == 0x04  # ZONE family
+    assert p.event_id & 0xFF == 0x05  # zone # 5
+
+
+def test_when_event_id_zone_1_secure() -> None:
+    """Second WHEN capture: ZONE 1 SECURE → event_id 0x0401."""
+    body = bytes.fromhex("05 00 00 00 00 00 00 00 00 04 01 00 00 00".replace(" ", ""))
+    p = Program.from_file_record(body, slot=6)
+    assert p.prog_type == ProgramType.WHEN
+    assert p.event_id == 0x0401
+
+
+def test_every_interval_5_seconds() -> None:
+    """EVERY record: interval at bytes 3-4 BE.
+
+    Empirical capture: "EVERY 5 SECONDS" trigger yields
+    08 00 00 00 05 00 ... at byte positions 0-5 (ProgType=7 at byte 0,
+    then zeros until byte 4 = 0x05 holding the interval low byte).
+    """
+    body = bytes.fromhex("07 00 00 00 05 00 00 00 00 00 00 00 00 00".replace(" ", ""))
+    p = Program.from_file_record(body, slot=2)
+    assert p.prog_type == ProgramType.EVERY
+    assert p.every_interval == 5
+
+
+def test_and_unit_1_on() -> None:
+    """AND IF UNIT 1 ON: byte 1 = 0x0A (CTRL family + ON bit), bytes 3-4 BE = 1.
+
+    Empirical capture from block 9 slot 18 — the structured AND test.
+    """
+    body = bytes.fromhex("08 0a 00 00 01 00 00 00 00 00 00 00 00 00".replace(" ", ""))
+    p = Program.from_file_record(body, slot=18)
+    assert p.prog_type == ProgramType.AND
+    # Byte 1 = 0x0a in the high byte means CTRL family (0x08) + ON bit (0x02)
+    assert p.and_family == 0x0A
+    # Family code (top 6 bits): CTRL = 0x08
+    assert p.and_family & 0xFC == 0x08
+    # Operand bit (bit 1 of family byte = bit 9 of compact cond u16): ON
+    assert p.and_family & 0x02 == 0x02
+    # Instance = unit #
+    assert p.and_instance == 1
+
+
+def test_and_zone_5_secure() -> None:
+    """AND IF ZONE 5 SECURE: byte 1 = 0x04 (ZONE + SECURE), bytes 3-4 BE = 5."""
+    body = bytes.fromhex("08 04 00 00 05 00 00 00 00 00 00 00 00 00".replace(" ", ""))
+    p = Program.from_file_record(body, slot=7)
+    assert p.prog_type == ProgramType.AND
+    assert p.and_family == 0x04  # ZONE family, SECURE operand (bit 1 = 0)
+    assert p.and_family & 0xFC == 0x04  # ZONE family
+    assert p.and_family & 0x02 == 0  # SECURE (operand bit clear)
+    assert p.and_instance == 5  # zone # 5
+
+
+def test_and_never() -> None:
+    """AND IF NEVER: byte 1 = 0x00 (OTHER family), bytes 3-4 BE = 1 (NEVER value)."""
+    body = bytes.fromhex("08 00 00 00 01 00 00 00 00 00 00 00 00 00".replace(" ", ""))
+    p = Program.from_file_record(body, slot=8)
+    assert p.prog_type == ProgramType.AND
+    assert p.and_family == 0x00  # OTHER family
+    assert p.and_instance == int(MiscConditional.NEVER)  # = 1
+
+
+def test_at_record_layout() -> None:
+    """AT record (multi-record TIMED): same byte layout as compact TIMED.
+
+    Empirical capture: AT 12:01 AM all-7-days yields:
+        06 00 00 00 00 00 00 00 00 05 0c fe 00 01
+    Where bytes 9-10 = [05, 0c] (month=5, day=12; no Mon/Day swap
+    since AT isn't EVENT-typed), byte 11 = 0xfe (Days: all 7),
+    bytes 12-13 = 00:01.
+    """
+    body = bytes.fromhex("06 00 00 00 00 00 00 00 00 05 0c fe 00 01".replace(" ", ""))
+    p = Program.from_file_record(body, slot=7)
+    assert p.prog_type == ProgramType.AT
+    assert p.month == 5
+    assert p.day == 12
+    assert p.days == 0xFE  # MTWTFSS (bit 1 through bit 7)
+    assert p.hour == 0
+    assert p.minute == 1
+
+
+def test_or_record_is_pure_discriminator() -> None:
+    """OR record: only ProgType set, all other bytes zero."""
+    body = bytes.fromhex("09 00 00 00 00 00 00 00 00 00 00 00 00 00".replace(" ", ""))
+    p = Program.from_file_record(body, slot=10)
+    assert p.prog_type == ProgramType.OR
+    assert p.cond == 0
+    assert p.cond2 == 0
+    assert p.cmd == 0
+    assert p.par == 0
+    assert p.pr2 == 0
+    assert p.month == 0
+    assert p.day == 0
+    assert p.days == 0
+    assert p.hour == 0
+    assert p.minute == 0
+
+
+def test_then_record_uses_compact_action_layout() -> None:
+    """THEN record (multi-record action): same cmd/par/pr2 layout as compact form.
+
+    Empirical capture: THEN UNIT 1 ON yields
+        0a 00 00 00 00 01 00 01 00 00 00 00 00 00
+    with cmd=1 (On), par=0, pr2=1 (UNIT 1, LE).
+    """
+    body = bytes.fromhex("0a 00 00 00 00 01 00 01 00 00 00 00 00 00".replace(" ", ""))
+    p = Program.from_file_record(body, slot=10)
+    assert p.prog_type == ProgramType.THEN
+    assert p.cmd == 1  # enuUnitCommand.On
+    assert p.par == 0
+    assert p.pr2 == 1  # UNIT 1 (LE u16 at bytes 7-8, same as compact)