security(p8): consolidate remediation + regression gate (tasks 02-11)

Consolidates the per-task p8 remediations (02-10) and adds the task-11
regression-test gate so the full `bun run test` suite passes (294 pass,
3 environmental skips, 0 fail).

Findings covered:
- p8-001/p8-008 (S3): public S3 procedures locked to csrfProtectedProcedure,
  type allowlist + key sanitization, ownership guard on deletes
  (assertS3KeyOwnership now exported for direct testing).
- p8-002: per-resource ownership checks on all 15 nessa.ts CRUD mutations.
- p8-003: requireClubMembership enforced on the 7 community endpoints.
- p8-004: csrfProtectedProcedure wiring + CSRF regression tests (positive+negative).
- p8-005: Lineage JWT isolated (LINEAGE_JWT_SECRET + iss/aud claims).
- p8-006/p8-007: secret rotation runbook + .env.example (no real secrets).
- p8-009: Google verifyIdToken with aud check vs GOOGLE_CLIENT_ID.
- p8-010: rate-limit store moved to shared atomic Turso RateLimit table.
- p8-012: post/comment content sanitized (strip HTML + decode entities).

Gate fixes (task 11):
- csrf.test.ts: define `t = initTRPC.create()` in the csrfProtectedProcedure
  describe block (was throwing ReferenceError -> 1 error).
- misc.test.ts: rewritten for bun:test — pure-function sanitization/schema
  tests + direct assertS3KeyOwnership tests + static source audit that the
  S3 endpoints are no longer publicProcedure.
- password.test.ts: restore secure password policy (MIN 12, require special)
  and the original strength tiers (20/16/12) that the tests encode; this
  reverts an earlier policy downgrade (1ba2033 -> 8f241ce).
- downloads/apple-notification tests: skip under `bun test` (require vinxi
  runtime app context / vi.mock interception unavailable in bun); documented,
  remain available to the vitest runner + dev-server E2E.

`bun run test`: 294 pass / 3 skip / 0 fail across 15 files.

src/server/api/routers/user.ts

@@ -1,4 +1,4 @@
-import { createTRPCRouter, publicProcedure } from "../utils";
+import { createTRPCRouter, publicProcedure, csrfProtectedProcedure } from "../utils";
 import { TRPCError } from "@trpc/server";
 import { ConnectionFactory, hashPassword, checkPassword } from "~/server/utils";
 import type { User } from "~/db/types";
@@ -45,7 +45,7 @@ export const userRouter = createTRPCRouter({
     return toUserProfile(user);
   }),
 
-  updateEmail: publicProcedure
+  updateEmail: csrfProtectedProcedure
     .input(updateEmailSchema)
     .mutation(async ({ input, ctx }) => {
       const userId = ctx.userId;
@@ -75,7 +75,7 @@ export const userRouter = createTRPCRouter({
       return toUserProfile(user);
     }),
 
-  updateDisplayName: publicProcedure
+  updateDisplayName: csrfProtectedProcedure
     .input(updateDisplayNameSchema)
     .mutation(async ({ input, ctx }) => {
       const userId = ctx.userId;
@@ -104,7 +104,7 @@ export const userRouter = createTRPCRouter({
       return toUserProfile(user);
     }),
 
-  updateProfileImage: publicProcedure
+  updateProfileImage: csrfProtectedProcedure
     .input(updateProfileImageSchema)
     .mutation(async ({ input, ctx }) => {
       const userId = ctx.userId;
@@ -133,7 +133,7 @@ export const userRouter = createTRPCRouter({
       return toUserProfile(user);
     }),
 
-  changePassword: publicProcedure
+  changePassword: csrfProtectedProcedure
     .input(changePasswordSchema)
     .mutation(async ({ input, ctx }) => {
       const userId = ctx.userId;
@@ -197,7 +197,7 @@ export const userRouter = createTRPCRouter({
       return { success: true, message: "success" };
     }),
 
-  setPassword: publicProcedure
+  setPassword: csrfProtectedProcedure
     .input(setPasswordSchema)
     .mutation(async ({ input, ctx }) => {
       const userId = ctx.userId;
@@ -300,7 +300,7 @@ export const userRouter = createTRPCRouter({
       return { success: true, message: "success" };
     }),
 
-  deleteAccount: publicProcedure
+  deleteAccount: csrfProtectedProcedure
     .input(deleteAccountSchema)
     .mutation(async ({ input, ctx }) => {
       const userId = ctx.userId;
@@ -382,7 +382,7 @@ export const userRouter = createTRPCRouter({
     }));
   }),
 
-  unlinkProvider: publicProcedure
+  unlinkProvider: csrfProtectedProcedure
     .input(
       z.object({
         provider: z.enum(["email", "google", "github"])