diff --git a/docs/timeline.md b/docs/timeline.md
index e9a3b5316..eb23f2614 100644
--- a/docs/timeline.md
+++ b/docs/timeline.md
@@ -10,24 +10,23 @@ The following chart shows all 29 epics across 9 legendary workstreams, 7 milesto
 @startgantt
 
 title CleverAgents Core — Epic-Level Project Schedule
-footer Generated 2026-04-08 | 29 Epics | 9 Legendaries | 7 Milestones | 6 Developers | ~1650 SP | ~878 open bugs | 1 open PR | Session 4 active
+footer Generated 2026-04-09 | 29 Epics | 9 Legendaries | 7 Milestones | 6 Developers | ~1650 SP | ~3000 open bugs | 156 open PRs | Session 4 active
 
 Project starts 2026-02-03
 saturday are closed
 sunday are closed
 printscale weekly zoom 2
 
-today is 2026-04-08
+today is 2026-04-09
 today is colored in #FF6666
 
 ' ================================================================
-'  GANTT CHART UPDATE LOG (Day 98 — 2026-04-08)
-'  Changes: Day 98 refresh. New build session #4799 launched 2026-04-08.
-'  Open PRs: 108→1 (massive merge wave). Open bugs: ~878 (stable).
-'  M3 73% (235/320), M4 67% (108/161), M5 71% (130/183), M6 29% (188/638, scope expanded!),
-'  M7 48% (150/312), M8 47% (403/855).
-'  Progress since Day 96: M3 +8%, M4 +7%, M5 +3%, M7 +5%, M8 +1%.
-'  M6 scope expanded massively: 327→638 total issues (+311 new issues added).
+'  GANTT CHART UPDATE LOG (Day 99 — 2026-04-09)
+'  Changes: Day 99 refresh. Session 4 active. 2 PRs merged today (#5264, #4197).
+'  Open PRs: 1→156 (new PRs opened by agents). Open bugs: ~878→~3000 (massive UAT expansion).
+'  M3 59% (245/416), M4 55% (108/197), M5 62% (130/210), M6 20% (193/975, scope expanded!),
+'  M7 45% (150/331), M8 46% (422/920), M9 29% (129/438).
+'  Milestone scopes grew significantly since Day 98 due to agent-driven issue creation.
 '  Session 4 active. Session tracker issue: #4799.
 ' ================================================================
 
@@ -400,15 +399,15 @@ legend right
   | v3.5.0 | Mar 10 | 2 | 151 | Autonomy hardening + server stubs |
   | v3.6.0 | Mar 27 | 2 | 100 | Deferred work |
   ----
-  **Risk Register (Day 96 — 2026-04-06)**
+  **Risk Register (Day 99 — 2026-04-09)**
   |= Epic |= Completion |= Risk |= Blocker |
-  | M3 (#357) | 65% | **CRITICAL** | 131 open issues in v3.2.0 |
-  | M4 (#358) | 60% | **CRITICAL** | 74 open issues in v3.3.0 |
-  | M5 (#359) | 68% | **HIGH** | 63 open issues in v3.4.0 |
-  | M6 (#360) | 55% | **HIGH** | 147 open issues in v3.5.0 |
-  | M7 (#361) | 43% | **HIGH** | 198 open issues in v3.6.0 |
-  | M8 (#362) | 46% | **HIGH** | 499 open issues in v3.7.0 (agent expansion) |
-  | SEC (#363) | 28% | **HIGH** | 336 open issues in v3.8.0 (agent expansion) |
+  | M3 (#357) | 59% | **CRITICAL** | 171 open issues in v3.2.0 |
+  | M4 (#358) | 55% | **CRITICAL** | 89 open issues in v3.3.0 |
+  | M5 (#359) | 62% | **HIGH** | 80 open issues in v3.4.0 |
+  | M6 (#360) | 20% | **CRITICAL** | 782 open issues in v3.5.0 (scope explosion) |
+  | M7 (#361) | 45% | **HIGH** | 181 open issues in v3.6.0 |
+  | M8 (#362) | 46% | **HIGH** | 498 open issues in v3.7.0 (agent expansion) |
+  | SEC (#363) | 29% | **HIGH** | 309 open issues in v3.8.0 (agent expansion) |
   ----
   **Color Key**
   |= Color |= Meaning |
@@ -416,11 +415,11 @@ legend right
   | <back:LightSkyBlue>    </back> | In Progress |
   | <back:#E8E8E8>    </back> | Not Started |
   | <back:Gold>  <>  </back> | Milestone Target |
-  | <back:#FF6666>  |  </back> | Today (2026-04-06) |
+  | <back:#FF6666>  |  </back> | Today (2026-04-09) |
   ----
   29 Epics | 9 Legendaries | 7 Milestones | 6 Developers
   ~1649 total story points | ~3300 estimated hours
-  **~878 open bugs — 108 open PRs — Session 3 active (16 workers, ~71 agents)**
+  **~3000 open bugs — 156 open PRs — Session 4 active**
 end legend
 
 @endgantt
@@ -444,7 +443,7 @@ saturday are closed
 sunday are closed
 printscale weekly zoom 2
 
-today is 2026-04-08
+today is 2026-04-09
 today is colored in #FF6666
 
 <style>
@@ -1965,13 +1964,13 @@ This section provides a high-level overview of the CleverAgents implementation r
 
 ### Current Status Summary
 
-As of Day 98 (2026-04-08), the project has **1 open PR** (down from 108 — massive merge wave!) and **~1458 open issues** across active milestones. **Session 4 is active (launched 2026-04-08, issue #4799) with 32 parallel workers and full supervisor fleet**. Bug count is **~878 open bugs** (stable). M8 (v3.7.0) is now **47% complete** (403/855 issues closed). M3 (v3.2.0) at **73%** (235/320), M4 (v3.3.0) at **67%** (108/161), M5 (v3.4.0) at **71%** (130/183), M6 (v3.5.0) at **29%** (188/638 — scope massively expanded from 327 to 638 issues), M7 (v3.6.0) at **48%** (150/312).
+As of Day 99 (2026-04-09), the project has **156 open PRs** and **~2846 open issues** across active milestones. **Session 4 is active (launched 2026-04-08, issue #4799) with 32 parallel workers and full supervisor fleet**. Bug count is **~3000 open bugs** (massive UAT expansion). M8 (v3.7.0) is now **46% complete** (422/920 issues closed). M3 (v3.2.0) at **59%** (245/416), M4 (v3.3.0) at **55%** (108/197), M5 (v3.4.0) at **62%** (130/210), M6 (v3.5.0) at **20%** (193/975 — scope massively expanded), M7 (v3.6.0) at **45%** (150/331).
 
-**M1, M2 fully complete. M3 (v3.2.0)**: 73% complete (235/320), 85 open issues. **M4 (v3.3.0)**: 67% complete (108/161), 53 open issues. **M5 (v3.4.0)**: 71% complete (130/183), 53 open issues. **M6 (v3.5.0)**: 29% complete (188/638), 450 open issues — scope expanded massively (+311 new issues). **M7 (v3.6.0)**: 48% complete (150/312), 162 open issues. **M8 (v3.7.0)**: 47% complete (403/855), 452 open issues. All milestones M3-M7 are **overdue**; M8 is in active v3.7.0 development.
+**M1, M2 fully complete. M3 (v3.2.0)**: 59% complete (245/416), 171 open issues. **M4 (v3.3.0)**: 55% complete (108/197), 89 open issues. **M5 (v3.4.0)**: 62% complete (130/210), 80 open issues. **M6 (v3.5.0)**: 20% complete (193/975), 782 open issues — scope expanded massively. **M7 (v3.6.0)**: 45% complete (150/331), 181 open issues. **M8 (v3.7.0)**: 46% complete (422/920), 498 open issues. **M9 (v3.8.0)**: 29% complete (129/438), 309 open issues. All milestones M3-M7 are **overdue**; M8/M9 in active development.
 
-!!! warning "Schedule Risk: All Milestones M3-M7 Overdue — ~878 Open Bugs — Session 4 Active (Day 98: New Session #4799, M6 Scope Expanded +311 Issues)"
+!!! warning "Schedule Risk: All Milestones M3-M7 Overdue — ~3000 Open Bugs — Session 4 Active (Day 99: 156 open PRs, M6 scope at 975 issues)"
 
-    All milestones M3 through M7 have passed their target dates. **Session 4 launched 2026-04-08 with 32 parallel workers**. Open PRs at **1** (down from 108 — massive merge wave). Open bugs at **~878** (stable). Session tracker issue: #4799. **Current priorities**: (1) **M6 scope explosion** — 450 open issues (was 147 at Day 96); agent-driven issue creation expanded scope from 327 to 638 total. (2) **Triage ~878 open bugs** — systematic review required. (3) **Continue M8 push** — 47% complete, 452 issues remaining. (4) **Clear M3/M4/M5 backlogs** — M3 at 73% (85 open), M4 at 67% (53 open), M5 at 71% (53 open).
+    All milestones M3 through M7 have passed their target dates. **Session 4 active (launched 2026-04-08, issue #4799)**. Open PRs at **156** (new PRs opened by agents). Open bugs at **~3000** (massive UAT expansion from 878). Session tracker issue: #4799. **Current priorities**: (1) **M6 scope explosion** — 782 open issues (975 total); agent-driven issue creation expanded scope dramatically. (2) **Triage ~3000 open bugs** — systematic review required. (3) **Continue M8 push** — 46% complete, 498 issues remaining. (4) **Clear M3/M4/M5 backlogs** — M3 at 59% (171 open), M4 at 55% (89 open), M5 at 62% (80 open).
 
 ### Parallel Workstreams
 
@@ -5223,3 +5222,96 @@ Story points per developer per milestone.
 | M9 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~TBD SP |
 | M6+ | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~TBD SP |
 | **Total** | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~1649 SP |
+
+### 2026-04-09 (Day 99)
+
+**Summary**
+
+Status: Behind 20+d
+Deadline risk: HIGH
+
+**Notes**
+
+- Day 99 update (2026-04-09). Session 4 remains active (issue #4799). 2 PRs merged today: #5264 (fix(ci): resolve lint errors and remove stale tdd_expected_fail tag) and #4197 (fix(plan): upsert action arguments during plan use to avoid UNIQUE constraint).
+- Open PRs grew from 1 to 156 since Day 98 — agents opened a large wave of new feature/fix PRs. Highest numbered open PR: #5393 (docs(spec): clarify agents validation attach synopsis).
+- Open bugs exploded from ~878 to ~3000 — massive UAT expansion driven by agent-driven bug discovery and filing. Total open issues: ~2846 (non-PR).
+- Milestone scope continued to grow since Day 98: M3 (320→416, +96 new issues), M4 (161→197, +36), M5 (183→210, +27), M6 (638→975, +337 — continued scope explosion!), M7 (312→331, +19), M8 (855→920, +65), M9 (438 total, 309 open).
+- Milestone completions (Day 99): M3 59% (245/416), M4 55% (108/197), M5 62% (130/210), M6 20% (193/975), M7 45% (150/331), M8 46% (422/920), M9 29% (129/438).
+- M3 apparent completion dropped from 73% to 59% due to scope expansion (+96 new issues). M6 dropped from 29% to 20% (scope grew +337 issues). All milestones M3-M7 remain overdue.
+- PR #4805 (docs: add Milestone Plan section to specification) remains open from Day 98.
+- Spec-updater issue #4807 (restructure monolithic specification.md) still open with `needs feedback` label.
+
+
+#### Milestone forecast
+
+| Milestone | Target -> ETA | Delta | Risk |
+|-----------|---------------|-------|------|
+| M1 (v3.0.0) | (2026-02-15) -> COMPLETE | 0d | COMPLETE |
+| M2 (v3.1.0) | (2026-02-22) -> COMPLETE | 0d | COMPLETE |
+| M3 (v3.2.0) | (2026-02-26) -> ETA 2026-05-15 | +78d | CRITICAL — 171 open issues; 59% complete (scope grew +96 since Day 98) |
+| M4 (v3.3.0) | (2026-03-02) -> ETA 2026-05-18 | +77d | CRITICAL — 89 open issues; 55% complete (scope grew +36 since Day 98) |
+| M5 (v3.4.0) | (2026-03-06) -> ETA 2026-05-15 | +70d | HIGH — 80 open issues; 62% complete (scope grew +27 since Day 98) |
+| M6 (v3.5.0) | (2026-03-10) -> ETA 2026-08-01 | +144d | CRITICAL — 782 open issues; 20% complete (scope grew +337 since Day 98!) |
+| M7 (v3.6.0) | (2026-03-28) -> ETA 2026-06-10 | +74d | HIGH — 181 open issues; 45% complete (scope grew +19 since Day 98) |
+| M8 (v3.7.0) | (no deadline) -> ETA 2026-07-20 | N/A | HIGH — 498 open issues; 46% complete (scope grew +65 since Day 98) |
+| M9 (v3.8.0) | (no deadline) -> ETA 2026-08-05 | N/A | MEDIUM — 309 open issues; 29% complete |
+
+#### Track forecast
+
+| Track | Status | ETA | Risk | Blocking |
+|-------|--------|-----|------|----------|
+| Track A (Plan lifecycle + persistence) | Complete | Done | LOW | None |
+| Track B (Projects/resources + sandbox) | In Progress | ETA 2026-05-15 | MEDIUM | 80 open issues in v3.4.0; continued agent-driven expansion |
+| Track C (Actors/tools/skills/validations) | In Progress | ETA 2026-05-18 | CRITICAL | 89 open issues in v3.3.0; UAT spec compliance bugs ongoing |
+| Track D (Change tracking + apply pipeline) | In Progress | ETA 2026-05-15 | CRITICAL | 171 open issues in v3.2.0; scope grew +96 since Day 98 |
+| Track Q (Quality automation) | Ongoing | N/A | CRITICAL | ~3000 open bugs (was ~878); massive UAT expansion; 156 open PRs |
+| Track T (Testing) | Active | Ongoing | HIGH | 156 open PRs need review; UAT pool supervisor active; M6 scope explosion |
+
+#### Developer forecast
+
+| Name | Days Ahead/Behind | Availability | Risk | Focus |
+|------|-------------------|--------------|------|-------|
+| Jeff | -24d behind | active | HIGH | Session 4 supervisor; M3/M4/M5 backlog clearance; architecture oversight; PR #4805 |
+| Luis | -24d behind | active | HIGH | M6 (v3.5.0) features; security hardening; PR review pool; 156 open PRs |
+| Hamza | -24d behind | active | HIGH | Resource DAG; v3.6.0 features; AWS CloudResource; PR reviews |
+| Aditya | -24d behind | active | HIGH | M5 features; TDD counterparts; domain model work; UAT testing |
+| Brent | -24d behind | active | HIGH | Bug fixes; TDD counterparts; quality automation; ~3000 open bugs triage |
+| Rui | -24d behind | active | HIGH | TUI features; UAT bug fixes; security bug-hunt; E2E testing |
+| Mike/Brian | N/A | standby | LOW | Infrastructure support |
+
+#### Task inventory
+
+Milestone per developer as of Day 99 (2026-04-09).
+
+| Milestone | Jeff | Aditya | Luis | Hamza | Brent | Rui | Unassigned | Total |
+|-----------|------|--------|------|-------|-------|-----|------------|-------|
+| M1 | 29/29 | 16/16 | N/A | 4/4 | 10/10 | N/A | 35/35 | 96/96 |
+| M2 | 26/26 | 14/14 | N/A | 1/1 | 5/5 | N/A | 6/6 | 56/56 |
+| M3 | N/A | N/A | N/A | N/A | N/A | N/A | 171 open | 245/416 |
+| M4 | N/A | N/A | N/A | N/A | N/A | N/A | 89 open | 108/197 |
+| M5 | N/A | N/A | N/A | N/A | N/A | N/A | 80 open | 130/210 |
+| M6 | N/A | N/A | N/A | N/A | N/A | N/A | 782 open | 193/975 |
+| M7 | N/A | N/A | N/A | N/A | N/A | N/A | 181 open | 150/331 |
+| M8 | N/A | N/A | N/A | N/A | N/A | N/A | 498 open | 422/920 |
+| M9 | N/A | N/A | N/A | N/A | N/A | N/A | 309 open | 129/438 |
+| **Total** | **N/A** | **N/A** | **N/A** | **N/A** | **N/A** | **N/A** | **~2110 open** | **1533/3639** |
+
+Note: "done/total" = closed/total for that milestone. Assignee data reflects Forgejo API as of Day 99 (2026-04-09). Most open issues are unassigned or assigned to freemo (Jeff). Agent-driven issue creation continues at high velocity. M3 grew +96 issues, M4 +36, M5 +27, M6 +337 (continued scope explosion), M7 +19, M8 +65 since Day 98. Open bugs grew from ~878 to ~3000 — massive UAT expansion. Open PRs grew from 1 to 156 as agents opened new feature/fix PRs.
+
+#### Story point allocation
+
+Story points per developer per milestone.
+
+| Milestone | Jeff | Aditya | Luis | Hamza | Brent | Rui | Unassigned | Total |
+|-----------|------|--------|------|-------|-------|-----|------------|-------|
+| M1 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~172 SP |
+| M2 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~208 SP |
+| M3 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~104 SP |
+| M4 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~126 SP |
+| M5 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~129 SP |
+| M6 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~TBD SP |
+| M7 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~100 SP |
+| M8 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~TBD SP |
+| M9 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~TBD SP |
+| M6+ | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~TBD SP |
+| **Total** | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ~1649 SP |