re: name the five mission-banner built-ins from call-site structure

77, 78, 81, 82 and 135 were unnamed. The engine has five contiguous strings
-- MISSION_START_PRT at 0x820A83F0, then _END_, _UPDATE_, _FAILED_,
_RESTART_ -- and five sequential ScriptPhase fields at +388/+392/+396/+400/
+404, stored in ascending order by one constructor region. Five names, five
fields, five unnamed built-ins.

Which is which is decided by call-site structure, measured over all 28
stages, and it is exact:

  39 MARK_LAST_PHASE   89 sites  -> 82 in 89/89
  82 banner_mission_failed        <- 39 in 89/89, then wait_s 89/89
  40 mark_not_last     50 sites  -> 78 (27) + 81 (17) + END_PHASE (6) = 50
  78 banner_mission_complete      <- 40 in 27/27
  81 banner_objective_update      <- 40 in 17/17
  77 banner_mission_start         22 sites in 22 stages, one per stage,
                                  after play_bgm
  135 banner_mission_restart      16 sites, after play_bgm, phase >= 2

39 -> 82 is a perfect pairing and 40's sites partition exactly three ways.

Stated as inferred rather than read: the string-to-field pairing itself comes
from both sequences ascending in the same order; my operand tracker did not
catch the string loads in that constructor. The ROLES above do not depend on
it.

76 is left unnamed on purpose. It has 38 sites = 22 + 16, exactly 77's count
plus 135's, and precedes them; its body sets [phase+332] = 1 and nothing in
the image reads that field. Suggestive arithmetic is not a name.

Flagged as a consequence: MARK_LAST_PHASE is followed by the FAILED banner in
89 of 89 sites and mark_not_last by END or UPDATE. So [phase+300] = 2 reads
less like "this is the last phase" than "end the mission now,
unsuccessfully" -- the existing names for that pair may be mis-framing it.

Artifact regenerated: docs/re/data/isl-stage02.txt.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE

docs/re/data/isl-stage02.txt

@@ -110,6 +110,7 @@ Generated by `tools/re-capture/isl_report.py calls`.
   115 named_event                 9
   48  squadron_escort             8
   39  MARK_LAST_PHASE             8
+  82  banner_mission_failed       8
   17  wait_frames                 6
   10  random                      6
   123 timer_resume                5
@@ -118,6 +119,10 @@ Generated by `tools/re-capture/isl_report.py calls`.
   52  play_stream                 3
   14  play_bgm                    3
   62  FORCE_END_PHASE             3
+  81  banner_objective_update     2
+  135 banner_mission_restart      2
+  78  banner_mission_complete     2
+  77  banner_mission_start        1
   127 timer_set                   1
 
 ## phase code bases
@@ -180,7 +185,7 @@ resync from 0x5058
 0052B0: 00000C13  call   len=12  k=00,00 0000005D 00000257  clear_flag(0xFFFFFFFF)
 0052BC: 00000C13  call   len=12  k=00,00 00000076 00000258  builtin118
 0052C8: 00000C13  call   len=12  k=00,00 00000027 0000025A  MARK_LAST_PHASE
-0052D4: 00000C13  call   len=12  k=00,00 00000052 0000025B  builtin82
+0052D4: 00000C13  call   len=12  k=00,00 00000052 0000025B  banner_mission_failed
 0052E0: 01021001  set.f  len=16  k=01,02 00000000 40100000 00000000  special[0] = imm 4
 0052F0: 02030C01  set.f  len=12  k=02,03 00000000 00000000  local[0] = special[0]
 0052FC: 00000C13  call   len=12  k=00,00 00000004 0000025C  wait_s(4)